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A traffic signal is typically controlled by a controller mounted inside a cabinet. [10] Some electro-mechanical controllers are still in use (New York City still had 4,800 as of 1998, though the number is lower now due to the prevalence of the signal controller boxes [11]). However, modern traffic controllers are solid state.
This happened whilst the train was still moving fast. In railway signalling, a token is a physical object which a train driver is required to have or see before entering onto a particular section of single track. The token is clearly endorsed with the names of the section to which it belongs. A token system is more commonly used for single ...
A block instrument on the Midland Railway. Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks". Only one train may occupy a block at a time, [1] and the blocks are sized to allow a train to ...
Signal types. North American signals are commonly of three types. Absolute – Absolute signals are usually connected to an interlocking controlled by a block operator or train dispatcher. Their most restrictive aspect is "stop" and trains cannot pass them at stop unless they obtain special authority.
Annett's key. In British, Australian, French, and Swiss railway signalling, an Annett's key is a form of trapped-key interlocking that locks levers or other items of signalling apparatus, thereby serving as a portable form of interlocking. The purpose is to prevent access from sidings to the running line without authority. [1]
The National Transportation Communications for Intelligent Transportation System Protocol (NTCIP) is a family of standards designed to achieve interoperability and interchangeability between computers and electronic traffic control equipment from different manufacturers. NTCIP has been around for over 20 years, but is increasingly in use in ...
This makes traffic regulation much easier for signalmen to handle among themselves. In some cases, a traffic regulator is appointed, who may be consulted for train working decisions. Following the accident at Ladbroke Grove in 1999, it was resolved that supervisors should be appointed at key signal boxes. However, these supervisors are not ...
Railway signalling. A Class 66 locomotive (right) is waiting at a red signal while a First Great Western (now Great Western Railway) passenger train (left) crosses its path at a junction. Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them ...