All American mainline railroads use Centralized Traffic Control in one form or another. That means the signal system is controlled remotely by a dispatcher and power switch machines are a part of that system.
When a dispatcher needs to move a train into or out of a siding, through a crossover between main tracks or any other move that may be included in the functioning of a control point, they can put a switch in normal or reverse remotely and the power power switch machine makes that possible.
In this video I'll go over how all that works as well as how a power switch machine, in this case an M-23, works internally and how it ties into the tracks and the control system.
Also, safety is of the utmost importance in railroad operations and all signal systems operate in a failsafe mode. Tampering with any part of the system puts all signals at stop and begins a chain that will dispatch personnel to the site.
So, join me for a walk through on power switch machines.
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