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A railway signal is a visual display device that conveys instructions or provides warning of instructions ... The left hand signal then controls the left-hand track ...
In any given country, rail traffic generally runs to one side of a double-track line, not always the same side as road traffic. Thus in Belgium, China, France (apart from the classic lines of the former German Alsace and Lorraine), Sweden (apart from Malmö and further south), Switzerland, Italy and Portugal for example, the railways use left-hand running, while the roads use right-hand running.
Current diesel engine design allows both left- and right-hand siting. Signals are most commonly mounted on trackside masts about 12 to 15 feet (3.7 to 4.6 m) high to put them in the eyeline of the engineer. Signals can also be mounted on signal bridges or cantilever masts spanning multiple tracks.
a 'block free' signal (green), meaning that the next block is clear or, in the case of a distant signal, that the next signal is also green; Warning signals or speed limits (yellow) requiring the driver to slow the train and especially to be able to stop before the next stop signal; Stop signals (red) require the train to stop.
Signal positioning guidance aims for a signal to be understood by a driver at a distance between 250–800 metres (270–870 yd) from the signal, with no obstructions within 40 metres (44 yd) and at a height of 2.5 to 3 metres (8.2 to 9.8 ft) above the left-hand rail.
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 February 2025. Directionality of traffic flow by jurisdiction Countries by direction of road traffic, c. 2020 Left-hand traffic Right-hand traffic No data Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side or to the right side ...
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.
Double junction, or level junction (left hand running). A double junction is a railway junction where a double-track railway splits into two double track lines. Usually, one line is the main line and carries traffic through the junction at normal speed, while the other track is a branch line that carries traffic through the junction at reduced speed.