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Moving block signalling works perfectly well

It is a myth that moving block signalling never works (NCE 11 November). The original Docklands Light Railway signalling system did not perform reliably, but this was actually automated fixed block. It was not designed to meet even the demand created by phase one of the Canary Wharf project. The replacement SELTRAC system, installed during 1990-1993, uses the moving block concept and has performed well.

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