''CITYFLO'' 650 signalling is a CBTC system designed by Bombardier Transportation and later Alstom. It makes use of bi-directional

radio communication Radio is the technology of telecommunication, communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transm ...

between

trains A train (from Old French , from Latin">-4; we might wonder whether there's a point at which it's appropriate to talk of the beginnings of French, that is, when it wa ... , from Latin , "to pull, to draw") is a series of connected vehicles th ...

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:

In revenue service

* Seattle Tacoma Int'l Airport, SeaTac, United States * Sacramento Int'l Airport, Sacramento, United States * San Francisco Int'l Airport, San Francisco, United States * McCarran Int'l Airport, Las Vegas, Nevada, United States * Phoenix Int'l Airport, Phoenix, United States * Dallas/Fort Worth Int'l Airport, Dallas, United States * SEPTA Subway-Surface Trolley Lines, Philadelphia, United States * Heathrow Int'l Airport, United Kingdom * Gatwick Int'l Airport, United Kingdom * Line 1 and Line 6, Madrid Metro, Spain * EverLine, South Korea * Wenhu line, Taipei, Taiwan * Line 3, Shenzhen Metro, China * APM Line, Guangzhou Metro, China * Line 2 and Line 3, Tianjin Metro, China * MRT Purple Line, Thailand * MRT Pink Line, Bangkok, Thailand * MRT Yellow Line, Bangkok, Thailand * Gold Line, Bangkok, Thailand * Line 9, MRT Kajang Line, Malaysia * Line 12, MRT Putrajaya Line, Malaysia * Line 15, São Paulo Metro, Brazil * M5 and M7,

Istanbul Metro The Istanbul Metro () is a rapid transit railway network that serves the city of Istanbul, Turkey. Apart from the M11 line, which is operated by TCDD Taşımacılık, the system is operated by Metro Istanbul, a public enterprise controlled by th ...

, Turkey

Under construction

* Dubai Int'l Airport, United Arab Emirates * King Abdulaziz Int'l Airport, Jeddah, Saudi Arabia * King Abdullah Financial District Monorail, Riyadh, Saudi Arabia * Metro Tunnel (Sunbury Dandenong Line), Melbourne, Australia * Line 7, Delhi Metro, India * Line 5 Eglinton, Toronto, Canada * Bukit Panjang LRT, Singapore

Test tracks

These dedicated lines are used to test compatible rolling stock: * Pittsburgh Test Track, United States * Kingston Test Track, Canada

References

Train protection systems Vehicle telematics {{Rail-transport-stub