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An axle counter sensor comprises two independent sensors (so the device can detect the direction and speed of a train by the order and time in which the sensors are passed). As the train passes a similar axle counter sensor at the end of the section, the system compares count at the end of the section with that recorded at the beginning.
CEL has also developed axle counter systems that are being used in Railway signaling system for safe running of trains. Railway products include Single Section Digital Axle Counters (SSDAC), High Availability SSDAC (HA-SSDAC), Multi-section Digital Axle Counter (MSDAC) & Block Proving by Axle Counter (BPAC) using Universal Fail Safe Block ...
Besides its signalling solutions [buzzword], Thales additionally develops electronic interlocking systems, axle counters that can replace track circuits, various types of point machines, and railway worker protection systems.
If the number of axles leaving the block section equals those that entered it, the block is assumed to be clear. Axle counters provide similar functions to track circuits, but also exhibit a few other characteristics. In a damp environment an axle counted section can be far longer than a track circuited one.
A CIP consists of 3 main processor modules which perform the safety-critical interlocking functionality. In addition it possesses two communications modules which provide redundant Ethernet connectivity (duplicated for availability) and two digital input modules (duplicated for availability) which can service up to 32 local inputs.
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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 ...