Here is a short video featuring the 36th St station on the NYC Subway in Brooklyn. Seen here is one of several switches south of the station - this particular switch allows northbound D trains to travel on the express track of the 4th Avenue Line in Brooklyn, as well as allow N trains to continue on this express track (from 59th St station). When the switch is set to the straight path (for N trains) and when the train in front has traveled several hundreds of feet away from the switch, trip arms seem to retract.
Негізгі бет Switch and Trip Arm at 36th St Station (D, N, R Trains)
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