CITYFLO 650 signalling is a CBTC system designed by Bombardier Transportation and later Alstom.

It makes use of bi-directional radio communication between trains and wayside equipment, as well as true moving block technology, to control train operation.

Trains report their position via radio, and a wayside signalling system provides movement authorities to the trains via a radio link.

Transit lines using the Cityflo 650 system as of February 26, 2014 include the following:[1] These dedicated lines are used to test compatible rolling stock: This rail-transport related article is a stub.

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