The pages listed below explain more about the various kinds of Human tower operator selecting the routings of trains. Must be and are controlled in a coordinated fashion known as interlocking, which usually involves a Signals in the vicinity of switches ('switch-tracks', 'points' (UK)) Overlap each other to keep trains at least one signal Control lengths and signal placements areĬhosen such that an out-of-control train 'tripped' by a train stop will come to a haltīefore reaching the obstruction or danger. To 'trip' noncompliant trains, that is, force them to obey signals The New YorkĬity subway relies on automatic train stops That is, that its control length is clear of dangers.

Parts of trains, or other obstructions anywhere in its control length, A signalīeing clear ( green or yellow) attests that there are no trains, or Length of a signal enforces that separation between trains. Every signal has a control length, defined as theĭistance, a number of whole blocks beyond the signal (i.e., in theĭirection of traffic governed by it), whose occupancy forces the Of a train in any part of it) or vacant (no train anywhere) atĪny time. Each block can either be occupied (any portion Occurs at an insulated joint (a block boundary), not every joint has a Two rails to indicate their presence in a block. Trains' wheels and axles short-circuit the Tracks are divided into track circuits (or sections, orīlocks), normally hundreds of feet long, by insulated Technologies are slowly being deployed on some lines the first to be cut over is the 'L', chosen because it shares no trackage with other routes, and has a relatively simple service pattern, i.e. (In-cab signalling and recent position- and radio-based Markedly since the opening of the IRT in 1904. Nearly all of the routes of the current subway are signalled withĬlassic wayside block signalling, whose principles have not changed Track circuits) to electrically detect the presence of trains. Tracks into discrete blocks (or track sections or Utilize the colors of lights (as opposed to semaphores or otherĭevices, or positions or shapes of lights), and rely on dividing Opposed to being overhead, or transmitted directly to the train), That is, signals are physically located to the side of the track (as

Subway use what is now called 'wayside color-light block signalling', Ce document également disponible en français

Openbve new york subway