Hi, a number of comments have mentioned not explaining what S&C stands for in this video, an over sight on my part! S&C stands for switches and crossings, the parts of the track that make up railway junctions and allow trains to move between different lines. If you want to know more, I have a video explaining what S&C is, which i would encourage you to check out: kzitem.info/news/bejne/ybCetqxqqWmnlm0
@B-and-O-Operator-Fairmont
4 ай бұрын
Here in the United States, reference to S&C is usually for "Signal and Communications".
@dangeary2134
4 ай бұрын
I had already figured that out in my own, knowing the British counterpart of what vernacular we speak. On this side of the pond, we call them guard rails.
@JoeHVACR
3 ай бұрын
@@B-and-O-Operator-Fairmont - also we used to call the cross overs “Frogs”
@daijoboukuma
4 ай бұрын
I've always wondered what the extra rails were for. Thank you for explaining this.
@thepwayengineer
4 ай бұрын
Happy to help!
@caneighdianjake8439
4 ай бұрын
As an engineer, I know how acronyms can quickly and easily become second nature when talking about a subject. Ive done it many times myself. I find its always useful to define an acronym at the first use in a report or presentation. You never know if there is someone in the audience who hasnt heard it, who learned the concepts in a different language (and thus use different acronyms) or are from a different culture that uses different terms, even if it is in the same language as yours.
@xouxoful
4 ай бұрын
In France we also have checkrails (contre-rails) on certain bridges even without curve. I bet it’s for preventing a rare but dramatic consequence of a derailment (falling from the bridge).
@josepherhardt164
4 ай бұрын
Not just France. I've seen a number of Fuehrerstandmitfahrt videos from various places where _every_ RR overpass or bridge has the double check rails, no matter how short the overpass or bridge may be.
@gregmichael8473
3 ай бұрын
I would classify those as Guard rails, although similar to Check rails, they are there in case of derailments to limit the amount of sideways movement and hopefully keep the vehicles on the bridge etc or stop them striking any structures supporting overhead bridges. Wheels do not normally come into contact with them, which does happen with check rails.
@realvanman1
4 ай бұрын
It should also be pointed out that, in a curve, that outer wheel climbing the rail, and the inner wheel doing the opposite, serves to make the effective diameter of the outer wheel larger, and the inner wheel smaller, helping to facilitate the negotiation of the curve.
@fulknerra6116
4 ай бұрын
That's the entire point of the conic section to the running surfaces of the wheels. Otherwise trains would only go in straight lines.
@kenharris5390
4 ай бұрын
I recall that some British heritage railway centres have had their 9F steam locomotives banned from main-line running by the rail operators because the centre driving wheel, which is flangeless, has been hitting the check rail when using points to cross from one track to another. Thanks for the great presentation.
@22pcirish
4 ай бұрын
True but also some check rails are proud (in height) of the running rail. This is why 9F’s are banned off the network due to the derailment risk of the unflanged wheel.
@thepwayengineer
4 ай бұрын
I never knew there were flangeless train wheels, thats interesting! Thank you for sharing and for the kind feedback
@22pcirish
4 ай бұрын
@@thepwayengineer the 9F is a 2-10-0 the centre axle driving wheel was designed to be flangeless to help negotiate curves S&C etc. But they are now banned due to Network Rail using raise check rails in places. Would cause the centre axle to ride up and derail. Go take a peek at Evening Star at York.
@paulmentzer7658
3 ай бұрын
On the old Streetcar line in Pittsburgh to Washington PA. The line started as a narrow Guage rail line in 1869. In 1905 the Pittsburgh Railway took over that line and install PA Guage (5 foot 2). Those narrow Guage rails were kepted as a check rail till the line was rebuilt in 1992.
@markh.6687
4 ай бұрын
Some American railroads used automatic greasing devices on some curves along with a check rail/guard rail setup trying to reduce friction and wear.
@MrLampbus
4 ай бұрын
I have also seen greasers on curves in the UK rail network ... specifically on a bend alongside the Norwich "Crown Point" rail depot where I used to work. I don't recall if there were check rails on that section.
@KaiHenningsen
4 ай бұрын
I do know those are used in Germany.
@thepwayengineer
4 ай бұрын
Also very common to see lubricators on the UK network as well.
@riogrande5761
4 ай бұрын
I've been a railfan all my life and I've never heard it called a check rail. But then I heard the accent of the narrator - it makes sense. Some call the wooden planks under the rails "sleepers" in the UK. In the US, we call them ties (cross ties). Two people separated by a common language!
@seanbohannon
4 ай бұрын
I've heard the term sleepers also used for the concrete ones used on some light rail systems in the US.
@danielstickney2400
4 ай бұрын
@@seanbohannon "Sleeper" is the generic English term for a horizontal beam placed on the surface of the ground to support a structure. A crosstie is a sleeper that crosses the roadbed and ties both rails together. All crossties are sleepers but not all sleepers are crossties. Sleepers are used in all sorts of construction, not just railroads.
@garthmcgibbon4285
4 ай бұрын
Sleeper someone who is asleep. Not a railroad tie.
@riogrande5761
4 ай бұрын
@@garthmcgibbon4285 Not to a brit.
@AndrewN75
4 ай бұрын
@@garthmcgibbon4285sleepers lie on a track bed...
@mossi5976
4 ай бұрын
I really like how the video is short and to the point! Lovely and well done!
@thepwayengineer
4 ай бұрын
Thanks so much! 😊
@balajisubbaiah
4 ай бұрын
I have travelled a lot in trains. Love the sound the of wheels passing over S&Cs, and the sideways jerks you feel. But always wondered from where that high pitched screeching noise was coming from, when the train was going around a bend. Now I know why. Thanks for the beautiful explanation with diagrams. Well done!!
@millsbobster
4 ай бұрын
thanks, i've seen these and wonndered what they were. nb, however, you don't define S&C in the video, and as a layman, i've no idea what this abbreviation is.
@gerardacronin334
4 ай бұрын
Switches and Crossings
@thomasstambaugh5181
4 ай бұрын
I wondered the same thing. I think "S&C" is an abbreviation for "(S)witch and "(C)rossing".
@mortensimonsen1645
4 ай бұрын
There was a link in the video - but a little hard to see
@thepwayengineer
4 ай бұрын
@thomasstambaugh5181 is spot on, it stands for Switches and Crossings. Sorry, I should have explained that!
@Xsiondu
4 ай бұрын
Just to add there was a link to S&C in the upper right when he first mentioned it. I luckily happened to notice it.
@B-and-O-Operator-Fairmont
4 ай бұрын
Very informative. In the US, we call them "guard rails" and they serve the same purpose. There are also special "frogs" (where the rails cross) called "self-guarding frogs" that have a lip on the outer edge that pushes a wheel "from the outside in" to follow the proper course through a frog. Those don't need a "check" or "guard" rail. Any I have ever seen are in slow speed applications like industrial tracks or shop areas but they may be exceptions.
@royreynolds108
3 ай бұрын
In steam days when the middle drivers were blind or flangeless, self-guarded frogs would deraill the blind wheels as they were wider than the flanged ones. And yes, self-guarded frogs are restricted to slow-speed areas of operation. Most self-guarded frogs are No. 8 or less and are cast manganese steel though I have seen a bolted frog. Due to the design, all of the wheels need to be of the same width, within tolerance, to work as designed.
@annthonypantaleon
4 ай бұрын
this topic is much appreciated! very nice discussion!
@thepwayengineer
4 ай бұрын
Glad you found it useful!
@tspis
4 ай бұрын
Are check rails also found in bridges, or are those something else? I seem to remember seeing them on pretty much every bridge
@thomasstambaugh5181
4 ай бұрын
At least in the US, those are called "guard rails". They interact with wheels only after a derailment -- their purpose is to reduce the risk that a derailed piece of equipment will fall off the structure. They act to keep the truck (or "bogie") vaguely aligned with the rail. In order to fall off or catastrophically interfere with the surrounding structure, the wheel must climb over the guard rail.
@tspis
4 ай бұрын
@@thomasstambaugh5181 Thanks for the explanation!
@garyhill9723
4 ай бұрын
@@thomasstambaugh5181thanks for the explanation, I’d seen them on the bridges in RailCowGirl videos from Norway and wondered if that was their purpose.
@screwdriver5181
4 ай бұрын
They are also guard rails in the UK. They have a totally different function to check rails in that they serve to restrain derailed wheel sets from moving too far sideways to try and prevent derailed vehicles hitting bridge parapets or supports. See the accident at Enschede in Germany for example.
@thepwayengineer
4 ай бұрын
Spot on! Very well explained thank you
@distinctdipole
4 ай бұрын
Thanks for another clear explanation. Fascinating finding out more about what the engineers I used to work with have to consider.
@thepwayengineer
4 ай бұрын
Thank you very much!
@Darara1987
4 ай бұрын
This is probably the first in-depth video explaining p-way engineering 👌🏾
@Dragonbear13-k2r
4 ай бұрын
What does “p-way” mean” since we seem to be talking about abbreviations, if you don’t mind?
@PJRayment
3 ай бұрын
@@Dragonbear13-k2r Permanent Way, as opposed to temporary tracks historically often used in construction of the railway.
@Bassotronics
4 ай бұрын
I've also seen on some crossings where the check rail is slightly higher than the main rail to further help avoid wheel climb.
@dsmreloader7552
4 ай бұрын
Thanks for the explanation, I've also seen these on bridge/trestles.
@CheMechanical
4 ай бұрын
Very informative video. Thank you for doing this. As already indicated by others, my only issue was not understanding the abbreviation S&C.
@rael5469
4 ай бұрын
0:56 I like the idea of the bent rail instead of the tapered one. The bent rail looks stronger.
@seanbohannon
4 ай бұрын
I've seen these and figured out the rough idea of why. This video was useful for some specific things I wasn't aware of, especially regarding angle of attack. I am curious why they seem to be common on wooden trestle bridges here in the Western United States, even perfectly straight bridges?
@b43xoit
4 ай бұрын
Wondering the same thing. Extra safety to prevent the train from falling off under some rare-but-possible circumstances? Oh, there's a video on it. kzitem.info/news/bejne/k4ljk6N4comjloI
@PJRayment
3 ай бұрын
As others have mentioned, these are different, normally having no contact with the wheels, being a safety feature in case of derailment, keeping the wheels close to where they should be.
@jeffreyharkness8551
4 ай бұрын
Why do trains use fixed axles instead of independent wheels on right and left sides? I would think that if the wheels could rotate independently, such as with a car or truck, that would eliminate or reduce greatly the possibility of a wheel derailing in a curve and the horrible squeal that the speed differential causes. We must have the bearing and suspension technology to support the wheels independently right and left.
@NicholasIstre
4 ай бұрын
Im pretty sure a fixed axle actually works with the conical shape of the wheels to keep the train centered on the rails. There are a number of videos that show the physics of this. If nothing else, independent wheels would make the whole setup much more expensive as the suspension systems would have to be much stronger to handle individual wheels instead of solid axles.
@thepwayengineer
4 ай бұрын
I think you have hit the nail on the head here!
@CanMadran
4 ай бұрын
Instant derailment
@johnkeepin7527
4 ай бұрын
@@NicholasIstre You’re right. The exact shape of the cone is important as well - not necessarily a constant angle. The mechanics of a suspension system has it’s part to play as well, as does the angle of the rails themselves, the amount of cant provided on curves, and how much cant deficiency (hence the permitted running speed) on a curve.
@kstricl
4 ай бұрын
Practical Engineering has a great video on this topic. It's based on US rail standards, but the essence is, the crown of the track and the angle of wheels work together to equalize the distance traveled by both sides of the axle. Likely also why the 200m guidance for tight curves as well, since that is the minimum radius that is accounted for in the basic design. Why add complexity to something that works well? Look at what happened in Germany when they tried to make an overly complex wheel for high speed rail.
@iainwalker8701
4 ай бұрын
Interesting and to the point, without added nonsense. Good video.
@michaelcerkez3895
4 ай бұрын
As a very young man I use to love walking the right of way. I would come across these at merging of tracks and I always thought it just seemed like extra track. Interesting physics involved here. Thank you.
@dxkaiyuan4177
4 ай бұрын
Czech rail is neighbour to German, Austrian, and Slovak rail
@warrenvincent8252
4 ай бұрын
Lol😂
@thepwayengineer
4 ай бұрын
😂😂😂
@James_Knott
2 ай бұрын
Check rails are also used on bridges, at least in Canada. You wouldn't want a train to go too far off track, when crossing a bridge!
@thepwayengineer
2 ай бұрын
In the UK we call them guard rails! Check rails keep trains on the track, guard rails stop them leaving the railway! Interesting the different uses of names around the world
@mskiptr
4 ай бұрын
3:55 what about 200.5 meters? Gotta love the lawyerspeak - so precise and yet so often just wrong!
@thepwayengineer
4 ай бұрын
Oooooo, split the difference. I would err on the side of caution and look to fit a check rail! Better safe than sorry
@martindindos9009
4 ай бұрын
You did not know there do not exist numbers that are not integers! Hence the radius of a curve clearly must be integer as well. By the same logic, pi equal to 3. \ironyoff
@j100j
4 ай бұрын
I guess they won't even think about check rails there.
@PJRayment
3 ай бұрын
My answer would be that curve radii are always designed in integers, or at the very least are always treated as being in integers. For example, the old Victorian Railways Grades Book, which included the curve radii of all curves (measured in chains i.e. multiples of close to 20 metres) are shown in whole numbers.
@johntomaszewski9602
4 ай бұрын
Excellent, well done presentation. Informative, concise, perfectly illustrated and narrated. Thank you!!
@Darara1987
3 ай бұрын
Love the videos as they have been very helpful as I work on the railway myself. Is their any way for you to make a video on what different roles on track are what it takes to do those jobs. I'm currently looking to do a Coss course and would like to know what it takes and what I need to know before taking course as I think this would be helpful ahead of time so I'm already familiar with the processes.
@arailway8809
4 ай бұрын
This is British rail terminology. And it is worth a listen. It is very well done.
@thepwayengineer
4 ай бұрын
Thank you for your kind words
@samspade2131
3 ай бұрын
Ok. Far more interesting than I expected. 🙂 Now, if I can only figure out what the gauges are on the platform walls down by the tracks I’d die a happy man.
@daved3494
4 ай бұрын
That was fascinating and very well delivered. Thank you
@markylon
4 ай бұрын
If you're going to educate people you need to do away with Acronyms. S&C needs to be told in full. Don't assume your audience knows this. I am sure if they know S&C then they will know what a check rail is. Railways are full of Acronyms don't use them for educational purposes and different countries use different acronyms.
@thepwayengineer
4 ай бұрын
Thank you for the feedback, thats a big takeaway for me on this video and something i will double check in my videos going forward
@robertlarson8370
4 ай бұрын
Thanks for clarification. I struggled with S&C here.
@LongerThanAverageUsername
4 ай бұрын
Acronyms are usually fine so long as you use the full phrase first and then use the acronym with the full phrase used every now and then as a reminder. For example, “…Switching and Crossing, or S&C for short…”
@coachhannah2403
4 ай бұрын
How about the check rails seen on trestles and bridges, which are usually straight track?
@MartinBrenner
4 ай бұрын
@@coachhannah2403 My thought as well. The reason is a bit different, they are there to prevent a derailed train from completely leaving the track.
@TheRealWindlePoons
4 ай бұрын
I served my apprenticeship at a UK company who manufactured switches and crossings, finally moving to other engineering challenges in 1986. I worked on several projects involving "swing nose" crossings which technically needed no check rail. Did anything come of swing-nose crossings?
@johnkeepin7527
4 ай бұрын
Some of them were, and might still be, in use between London Paddington & Hayes & Harlington, on the higher speed S&C. Without them, there would be too wide a gap for the wheels to pass over. Loads more elsewhere, typically with 70 mph turnouts, like the Wootton Bassett Down Main/Down Badminton junction. So more power operation & detection equipment to maintain etc.
@Hemond1
3 ай бұрын
Grew up along the Northeast Corridor. As kids, we used the tracks as highways, (to school, the store...) THese short rails were found along the track but I never paid attention, Now I know what they are.
@tomv4408
4 ай бұрын
I always wondered about those. Thanks for the explanation!
@thepwayengineer
4 ай бұрын
Happy to help!
@FeckHallBahn
2 ай бұрын
Brilliant explanation, thank you. Subscribed.
@thepwayengineer
2 ай бұрын
Welcome aboard!
@Rennrogue
3 ай бұрын
Nice clear explanation. Thanks!
@thepwayengineer
3 ай бұрын
Glad it was helpful!
@starzing9043
4 ай бұрын
Ahhh the tight radius curve the reason for he beloved boylston squeal on Boston’s green line
@phillipcollins9290
3 ай бұрын
Something that always amazes me: the Rhätischebahn in Switzerland has some very tight curves (e.g. on the Berninabahn to Tirano), and yet there seem to be no check rails. Any idea why? Checkrails are used quite liberally in hilly areas of South Africa on curves of a wider radius than those of the Berninabahn.
@Photomosaique
2 ай бұрын
We can see also check rails on bridges, in this case, this is not to avoid to derail, but if this occurs, this third rail help to maintain the train on the railway insteed of falling outof the bridge.
@marcdenton2996
4 ай бұрын
Thank you. Always wondered about this.
@LostsTVandRadio
4 ай бұрын
Thank you - a very good explanation (I hadn't heard the term S&C before, but I worked it out). Do we actually use the term switch in the UK?
@thepwayengineer
4 ай бұрын
Yes we do! I have found track staff tend to call them switches where as signalling staff tend to refer to them as points If you are interested in switches I do have a video on them: kzitem.info/news/bejne/ppqntKR6p2Noqn4
@LostsTVandRadio
4 ай бұрын
@@thepwayengineer Ahhh, interesting! Thanks :)
@guildrich
3 ай бұрын
Not sure about the UK, but here in the US, there are also check rails on railroad bridges/trestles for the same reason.
@James_Knott
2 ай бұрын
Same in Canada/
@bgideon27
3 ай бұрын
Great lesson.
@thepwayengineer
3 ай бұрын
Glad you liked it!
@thedownwardmachine
4 ай бұрын
So the check rail on a curve is installed on the inside rail to prevent the outside wheel flange from climbing the rail, right?
@ryuuguu01
4 ай бұрын
Yes, I think so from rewatching ,the photo the check rail is only on the inside of the curve. That is also how I understood it.
@thepwayengineer
4 ай бұрын
You are correct!
@pedzsan
4 ай бұрын
The weakness in this logic is the flange on the inside could climb the check rail just like the flange on the outside could climb the running rail.
@ryuuguu01
4 ай бұрын
@@pedzsan It is not the same because the shape of a wheel is not symmetric. If there was a high chance of the flange riding up the check rail they could have raised rail to stop that. I think it was not necessary to raise it so they did not because that would increase costs.
@josepherhardt164
4 ай бұрын
@@thepwayengineer I have seen one Fuehrerstandmitfahrt video where a check rail followed the OUTSIDE rail on a curve. Noticed it immediately and thought, "How is THAT supposed to work?"
@tomz1daful
4 ай бұрын
This was informative. Thank you for the content.✨
@Xsiondu
4 ай бұрын
This is fun. I'm subscribed.
@clydecessna737
3 ай бұрын
I've always wanted to know!
@neiloflongbeck5705
4 ай бұрын
Or in imperial units, on standard gauge track, a radius of 660ft.
@bryankirk
4 ай бұрын
Thank you Sir. That was s very interesting and informative video. Cheers
@rael5469
4 ай бұрын
2:56 I never understood the move to concrete rail ties. Wood has some give in it so it seems like it would be easier on the rails and the train cars. Concrete has no give and it must be both harder on equipment and louder, I would think.
@James_Knott
2 ай бұрын
It also lasts longer and is better for high traffic areas. Also, right now, there's an LRT line being installed right by my condo. It uses concrete blocks, which the rails attach to. These blocks are placed on the reinforcing mesh and then concrete poured around them.
@rael5469
2 ай бұрын
@@James_Knott Interesting. Thanks James.
@paulmeynell8866
4 ай бұрын
You learn something new everyday 😮 thank you
@thepwayengineer
4 ай бұрын
Thats what I like to hear!
@MichaelMossmanNZ
4 ай бұрын
I find trains fascinating, but I'm just a casual observer. To think that the outside wheel could climb the track & possibly cause a derailment is scary! On a lighter note, I enjoyed the video, and was intrigued by the optical illusion seen at 5:20 where the train's shadow can be seen on the right-hand side of the bridge =)
@davidb3172
3 ай бұрын
Your picture of concrete sleepered track at the start of the video looks like that from Sri lanka. 5'6" gauge.
@sharpfang
4 ай бұрын
"The check rail, if installed correctly..." I'm sensing an epic untold story here. Or several.
@julianwinn4502
4 ай бұрын
Very interesting. Often wondered what these were for.
@Mcbunaen
4 ай бұрын
I've seen check rails here in the US on bridges, presumably to give extra assurance that there will be no derailment at such an inconvenient place.
@martindindos9009
4 ай бұрын
Different role on bridges. Those are guard rails (the gap to running rails is larger). Their role is not to prevent derailment but to ensure that the wheel after derailment does not move too far from the railhead to hit the bridge construction or fall over from the bridge.
@creamwobbly
4 ай бұрын
0:49 Bent rails are standard rail profile, which invalidates what was claimed earlier. Maybe get someone to proofread and edit your stuff before you release it.
@davidballoid2118
3 ай бұрын
Check Rails are also found on bridges while on straight sections of track.
@gregmichael8473
4 ай бұрын
Thanks for a very informative and well explained video on this topic.
@thepwayengineer
4 ай бұрын
Thank you for the kind words!
@jonathonshanecrawford1840
4 ай бұрын
G'Day Sir! An Australian here, I seen something like check rails on and under railway bridges, some one said they are AKA *stabiliser rails.* _sorry I can not paste an image, after its KZitem)_ _As to curves, would check rails reduce the high pitch screaming noise trains make?_ I know it has nothing to do with the gauge of the track as it happens on the Narrow, Standard and Broad gauges!
@DH-sw6vg
4 ай бұрын
Q: On many train tressels and bridges there are a *_second_* set of rails about 6-inches inside the main rails which narrow and sometimes almost converge in the center at each end of the bridge. Can you tell us what those are for? Thanks!
@cmmartti
4 ай бұрын
What is "S&C"?
@thepwayengineer
4 ай бұрын
S&C is short from Switches and Crossings. Apologies, I should have explain this better in the video If you are interested in switches and crossings I do have a video on the subject: kzitem.info/news/bejne/ppqntKR6p2Noqn4
@jarvisa12345
3 ай бұрын
@@thepwayengineer I looked it up before I saw your reply. Apparently it stands for ‘Settle and Carlisle’. 😀
@onkelfabs6408
4 ай бұрын
Check rails are also common on bridges. Or is that not the case in the UK?
@DeereX748
4 ай бұрын
What are the inner rails called (and what do they do) that you see on bridges or trestles? These rails are joined at a point on each end, curving to the center between the traveling rails, and they extend the full length of the bridge. You see them on straight as well as curved sections of track, and the flangeway gap seems wider than on these check rails you are describing.
@nicolaecampan2385
4 ай бұрын
Are`nt the check rails used on the bridges as well? Thanks!
@Someone-ct7gs
3 ай бұрын
On a tight curve, if the flange on the outer wheel can climb the rail, what prevents the flange on the inner wheel from climbing the check rail?
@N330AA
4 ай бұрын
Wow this is very informative.
@robertaries2974
4 ай бұрын
Everyone has mentioned the use of S&C and yet haven't said what it means. After looking it up it means Switches & Crossings. Please can you add this to the description or pin this comment so others can understand
@thepwayengineer
4 ай бұрын
Pinned a comment to address this, apologies
@astragreen
4 ай бұрын
Why have check rails on one side, sometimes opposite the direction of travel, also why have check rails on both rails of a curve while sometimes only on one side whenever traffic is running on the up and down lines on the same track?
@stevek9670
4 ай бұрын
We call them guard rails in here in the US
@caneighdianjake8439
4 ай бұрын
Isnt there also a third common use for check rails: to act as a sort-of guard rail to prevent derailed rolling stock from travelling outside of restricted clearances along tracks? Or do those types of rails have a different name? I know it is common to have extra rails along track with restricted clearance for safety reasons, such as along tunnels, bridges, crossings, or near vital infrastructure (such as support pillars)
@jm56585
4 ай бұрын
I always thought the wheel would try to climb the check rail and cause derailments in configurations like in 5:14, are check rails harder for wheels to climb than normal rails?
@rexsmith9577
3 ай бұрын
On bridges too? I have often seen check rails on bridges.
@robertheinkel6225
4 ай бұрын
I have seen the check rails mostly on bridges.
@vsiegel
3 ай бұрын
What about curves that are 200.5 m long?? [SCNR]
@robinbeckford
4 ай бұрын
Is this connected in any way with the screeching sounds heard when a train is slowly crossing multiple lines on its way into a main terminus?
@GabrielSBarbaraS
4 ай бұрын
I have seen these check rails on train bridges also. Your thoughts?
@bingbong7316
4 ай бұрын
200m ~= 10 chains, for us elderly folk.
@thepwayengineer
4 ай бұрын
Oh yes! Only British railways would run with two sets of measurements in common use!
@dongeorge4037
4 ай бұрын
Well explained.
@michaelguerin56
4 ай бұрын
Soo … the check rail on the inside of a corner essentially does the same job as a yacht crew leaning out over the exposed hull side of a yacht OR the ‘passenger’ in a racing motorcycle sidecar combination.
@DougGrinbergs
4 ай бұрын
1:27 S&C definition? Swirch, crossing?
@mybachhertzbaud3074
4 ай бұрын
Admittedly, this is not a topic I think about much but I am interested to know if anyone even studies whether our existing rail is the best and safest design possible or is this just another "This is the way we do it" mentality that prevails because of cost?🤔
@EeBee51
4 ай бұрын
I forget the source, but I read an article on just how much research there was done on this. Over the tears many different profiles have been tried and experimented with. The current profile has been found to be the best and is used universally.
@davidgallagher171
4 ай бұрын
Also, found on bridges.
@CrazyPetez
4 ай бұрын
As an old American train enthusiast, I have never heard of a check rail. From early in your video, we called them guard rails. Same thing?
@markh.6687
4 ай бұрын
Yes.
@thomasstambaugh5181
4 ай бұрын
@@markh.6687 Actually no. A check rail interacts with a each passing wheel. A guard rail interacts only with already derailed wheels.
@ethanlamoureux5306
4 ай бұрын
@@thomasstambaugh5181 Actually, yes. In America a guard rail is what this video calls a check rail, and it also stands for the extra rails to prevent derailed trains from leaving the track. Also in America we have a name for the device that allows two rails to cross, we call it a frog.
@thepwayengineer
4 ай бұрын
I think this is a difference in terminology. From some research in the US they are indeed called guard rails, whereas within the UK guard rails are to help stop derailed trains leaving structures etc. Within the UK, fogs are called crossings. Same same but different!
@markh.6687
4 ай бұрын
@@thomasstambaugh5181 Source of your claim, because the terms are used interchangeably to describe derail prevention rails.
@jre617
2 ай бұрын
S&C? Oh I see, the definition is in the text below the video. You didn't say in the video. I guessed switch and crossover. A crossing and a crossover are two different things, at least in the US.
@thepwayengineer
2 ай бұрын
An oversight on my behalf!
@Stephen_The_Waxing_Lyricist
4 ай бұрын
Okay... but what does S&C stand for?????
@aliuyar6365
4 ай бұрын
thnks
@thepwayengineer
4 ай бұрын
My pleasure!
@tomrobertson3236
4 ай бұрын
I have a bridge with a check rail Just outside of yard Slow speed Straight away
@leonvanderlinde5580
4 ай бұрын
You missed one place check rails are used. On bridges over water. Ther they use two check rails.
@thepwayengineer
4 ай бұрын
I know these as guard rails rather than check rails, and they are there as a mitigation once a train has already derailed! So serving a slightly different function
@DavidR_192
4 ай бұрын
Good video; other than you explained everything well, yet just referred to "S&C" as a main principal of your explanation. You never clarified what "S&C" is. Abbreviations are good to save effort and time but on the first reference, the abbrieviation should be clarified. [Edit: just read your pinned note. Yep, definitely an oversight!].
@jamesalles139
4 ай бұрын
4 Al Gore's rhythm Thanks!
@eliasthienpont6330
4 ай бұрын
🦁🦁🦁🦁🦁 THE LION WAS HERE 🦁🦁🦁🦁🦁 No. 406
@erbenton07
4 ай бұрын
Great video, but what does S&C stand for?
@thepwayengineer
4 ай бұрын
Hi, thank you! S&C stands for Switches and Crossings. apologies i should have explained this in the video, an oversight from me. I have a video explaining what S&C is that might be helpful for you: kzitem.info/news/bejne/ybCetqxqqWmnlm0
@22pcirish
4 ай бұрын
Switches and crossings. (Point work in old parlance)
@ThePaulv12
4 ай бұрын
S&C? Why not use novice lingo so we mere plebs can understand? Internal industry acronyms are neaseating ergh ergh ergh...
@thepwayengineer
4 ай бұрын
Completely understand and agree. It is something I will hold my hands up and say I missed when creating this video! I will focus on this when scripting videos going forward. Thank you for watching
@bulwinkle
4 ай бұрын
Comment for the algorithm.
@ArthurKorn
3 ай бұрын
Check rails are used to export cars to Germany of course!
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