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Company typeRadio-based true moving block CBTC railway signalling system
IndustryRail signalling
HeadquartersBombardier Transportation Rail Control Solutions, Årstaänsvägen 29, Stockholm, Sweden
WebsiteCITYFLO 650 CBTC system

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

Transit lines using the Cityflo 650 system as of February 26, 2014 include the following:[1]

In revenue service

Under construction

Test tracks

These dedicated lines are used to test compatible rolling stock:


  1. ^ "CBTC Map CF650 26 Feb 2014" (PDF). Bombardier Transportation.
  2. ^ "Bombardier Wins Contract to Provide Melbourne's First High-Capacity Signalling System - Bombardier".[dead link].
  3. ^ "Bombardier Wins Third Mass Transit Complete Signalling System in Brazil". GlobeNewswire (Press release). 2011-09-21. Retrieved 2019-07-06.
  4. ^ Bombardier. "Bombardier CBTC Systems". Archived from the original on 2021-08-09. Retrieved 2021-08-08.