On a short stretch of track in London, William Robert Sykes tested the first track circuit at Brixton in 1864. In 1872, William Robinson invented the first fail safe track circuit and a method of block occupancy detection was born. 140 years later, block occupancy detection using track circuits (or conventional signalling) is still in use today.

Over the past 25 years the tide is changing as CBTC technologies find their way into traditional track circuit based applications. The primary advantage of a CBTC system is its ability to allow trains to operate safely at much closer headways then is possible in a track circuit based application due to its (track circuits) inherent limitation.

But what is CBTC?

This video defines CBTC based on the 3 characteristics described in the IEEE 1474.1 standard.

Naeem Ali
CBTC Specialist
Director & Principal Consultant
CBTC Solutions Inc.

CBTCSolutions.ca

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