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A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed. [1] The driver interprets the signal's indication and acts accordingly.
The railroad then developed a more effective system consisting of wooden balls, painted red, white or black, and hoisted up or down a pole on a rope-and-pulley system. The initial use of these signals was merely to indicate the on-time status of trains, rather than to control train movements.
The final 'Call-on', Shunt' or 'Warning' arms on the Western Region were 2 feet (0.61 m) with red-white-red horizontal stripes and showed a reduced light during darkness with the appropriate black letter, C, S or W, back-lit in the 'proceed' state with a green light shown in that mode. The stop aspect was generally lunar-white during darkness.
In the UK, every section of railway line has a maximum speed, known as the Permissible speed. [20] Table A of the Network Rail Sectional Appendix provides a list of these. Where there is a change in permissible speed on a line, a permissible speed indicator sign will show the new speed.
The current Dutch railway signalling system operated by ProRail has been in effect since 1954 on the Dutch Railways network. [ 1 ] It was designed to be one of the simplest in Europe and is integrated to the ATB , the system of cab signalling widespread on the Dutch network.
For readers: When self-defined legend is provided in the map, it takes precedence over this one. For editors: Wikipedia:Route diagram template
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 uniquely susceptible to collision . This susceptibility is exacerbated by the enormous weight and inertia of a train, which makes it difficult to quickly stop when encountering an obstacle.
The 'figure' must be black on a white symbol field, and never the reverse, white symbols on a black field. [ 2 ] Symbols were determined to be typically legible from approximately 30 feet (9.1 m) with a 3 inches (76 mm) symbol to 155 feet (47 m) with a 12 inches (300 mm) symbol.