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An axle counter is a system used in railway signalling to detect the clear or occupied status of a specified section of track. The system generally consists of a wheel sensor (one for each end of the section) and an evaluation unit for counting the axles of the train both into and out of the section.
Illustration of track circuit invented by William Robinson in 1872 Track circuit transformer on the right, new axle counter on the left (Slovenia). A track circuit is an electrical device used to prove the absence of a train on a block of rail tracks to control railway signals. An alternative to track circuits are axle counters.
The modern-day system mostly uses two, three, and four aspect colour-light signals using track circuit – or axle counter – block signalling. [1] [2] It is a development of the original absolute block signalling that is still being used on many secondary lines. The use of lineside signals in Britain is restricted to railways with a maximum ...
The first computerized detectors had lights indicating the nature of defect and a numeric display of the associated axle number. Seaboard Air Line was the first railroad to install defect detectors which "spoke" their results over radios carried by train crew starting around 1960, with the first being installed in Riceboro, Georgia , on their ...
CBTC is a signalling standard defined by the IEEE 1474 standard. [1] The original version was introduced in 1999 and updated in 2004. [1] The aim was to create consistency and standardisation between digital railway signalling systems that allow for an increase in train capacity through what the standard defines as high-resolution train location determination. [1]
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In a basic railway situation, the token can be collected personally by the driver at the start of the crew's work on a branch line, and surrendered at the end of their work there. Where the single line section is part of a through route, then it is likely that each passing train would require to surrender and collect a token at each token station.
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