''CITYFLO'' 650 signalling is a

CBTC Communications-based train control (CBTC) is a railway signaling system that uses telecommunications between the train and track equipment for traffic management and infrastructure control. CBTC allows a train's position to be known more accu ...

system designed by

Bombardier Transportation Bombardier Transportation was a Canadian-German rolling stock and rail transport manufacturer, headquartered in Berlin, Germany. It was one of the world's largest companies in the rail vehicle and equipment manufacturing and servicing industry ...

. It makes use of bi-directional

radio communication Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a trans ...

between

trains In rail transport, a train (from Old French , from Latin , "to pull, to draw") is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives (often know ...

and wayside equipment, as well as true

moving block In railway signalling, a moving block is a signalling block system where the blocks are defined in real time by computers as safe zones around each train. This requires both knowledge of the exact location and speed of all trains at any given ti ...

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, USA * Sacramento Int'l Airport, Sacramento, USA * San Francisco Int'l Airport, San Francisco, USA * McCarran Int'l Airport, Las Vegas, NV, USA * Phoenix Int'l Airport, Phoenix, USA * Dallas/Fort Worth Int'l Airport, Dallas, USA *

SEPTA Subway-Surface Trolley Lines The Southeastern Pennsylvania Transportation Authority (SEPTA) is a regional public transportation authority that operates bus, rapid transit, commuter rail, light rail, and electric trolleybus services for nearly 4 million people in five cou ...

, USA * Heathrow Int'l Airport, UK * Gatwick Int'l Airport, UK * Line 1 and Line 6,

Madrid Metro The Madrid Metro ( Spanish: ''Metro de Madrid'') is a rapid transit system serving the city of Madrid, capital of Spain. The system is the 14th longest rapid transit system in the world, with a total length of 293 km (182 mi). Its gr ...

, Spain * Yong-In ART, South Korea * Wenhu Line, Taipei, Taiwan *

Line 3, Shenzhen Metro Shenzhen Metro Line 3 (formerly branded as Longgang line), runs northeastward from to . Line 3 opened on 28 December 2010. Line 3's color is . Since opening, it has been heavily trafficked and became a major transport option for urban workers. ...

, China * APM Line,

Guangzhou Metro The Guangzhou Metro () ( and ) is the rapid transit system of the city of Guangzhou in Guangdong Province of China. It is operated by the state-owned Guangzhou Metro Corporation and was the fourth metro system to be built in mainland China, af ...

, China * Line 2 and Line 3,

Tianjin Metro The Tianjin Metro or Tianjin Rail Transit is the rapid transit system in the city of Tianjin, which was the second city in mainland China after Beijing to operate a subway system (the Beijing Subway opened in 1971). Opened in 1984, the sys ...

, China * Purple Line, Thailand *

Klang Valley MRT The Klang Valley Mass Rapid Transit project is a planned three-line mass rapid transit (MRT) system in the Klang Valley (Greater Kuala Lumpur), an urban conurbation in Malaysia which includes the capital city of Kuala Lumpur. The MRT lines, wh ...

, Malaysia * Line 5 and Line 15, São Paulo Metro, Brazil * Üsküdar-Ümraniye-Çekmeköy Line, Turkey * Bangkok Gold Line feeder system, Thailand *

Munich Airport Munich International Airport- Franz Josef Strauß (german: link=no, Flughafen München) is an international airport serving Munich and Upper Bavaria. It is the second-busiest airport in Germany in terms of passenger traffic after Frankfurt A ...

, Germany

Under construction

* BTS Yellow Line Monorail (EBM), Thailand * BTS Pink Line Monorail (NBM), Thailand * 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 * MRTA Pink Line and Yellow Line, Thailand * Line 7,

Delhi Metro The Delhi Metro is a mass rapid transit (MRT) system serving Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh, in the National Capital Region of India. The network consists of 10 colou ...

, India * Sungai Buloh–Serdang–Putrajaya MRT line, Malaysia *

Line 5 Eglinton Line 5 Eglinton (also known as the Eglinton Crosstown or the Crosstown) is a light rail line that is under construction in Toronto, Ontario, Canada. Owned by Metrolinx and operated by the Toronto Transit Commission (TTC), the line will be part of ...

, Toronto, Canada *

Bukit Panjang LRT The Bukit Panjang LRT line (BPLRT) is a automated guideway transit line in Bukit Panjang, Singapore. The BPLRT is the only LRT line operated by SMRT Trains. As the name suggests, it serves 13 stations in the neighbourhood of Bukit Panjang an ...

, Singapore

Test tracks

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

References

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