SelTrac. SelTrac is a digital railway signalling technology used to automatically control the movements of rail vehicles. It was the first fully automatic moving-block signalling system to be commercially implemented.

SelTrac was originally developed in the 1970s by Standard Elektrik Lorenz (the "SEL" in the name) of Germany for the Krauss-Maffei Transurban, an automated guideway transit system proposed for the GO-Urban network in the Greater Toronto Area in Canada. Although the GO-Urban project failed, the Transurban efforts were taken over by an Ontario consortium led by the Urban Transportation Development Corporation (UTDC), and adapted to become its Intermediate Capacity Transit System (ICTS). This technology was first used on the SkyTrain network in Vancouver, British Columbia and the Scarborough RT in Toronto, Ontario.

SelTrac was primarily sold and developed by Alcatel, through a subsidiary. SelTrac was then sold by Thales from their Canadian unit, after it purchased many of Alcatel's non-telephony assets.

On May 31, 2024, Hitachi Rail completed the acquisition of Thales' Ground Transportation Systems (GTS) business, making SelTrac a product of Hitachi.

Description
SelTrac uses the twisted-loop concept developed by Siemens in the 1950s.

Data communication is provided with either low frequency inductive loop or a high bandwidth, open-standards wireless system incorporating spread-spectrum radio technology.

Installations 
SelTrac is installed in many railways around the world, including the following:

 Ankara Metro Line M1 1997 SelTrac CBTC DTO 
 Beijing Subway Line 4 2009 SelTrac CBTC/R (radio) ATO with Attendant 
 Busan–Gimhae Light Rail Transit 2011 SelTrac CBTC/R UTO
 Detroit People Mover 1987 SelTrac CBTC UTO
 Dubai Metro – Red and Green Lines 2009/2011 SelTrac CBTC UTO
 Guangzhou Metro 
Line 3 2009/10 SelTrac CBTC DTO
Line 9 2017 SelTrac CBTC DTO
Line 14 2017 SelTrac CBTC DTO
Line 21 2017 SelTrac CBTC DTO
 Hong Kong International Airport APM 2014/15 SelTrac CBTC/R UTO
 Hong Kong MTR
 Tuen Ma line 2003 SelTrac CBTC DTO
 West Rail line 2003
 Ma On Shan line 2004
 Kowloon Southern Link 2009
 Tuen Ma line (Phase 1) 2020
 Tuen Ma line (full line) 2021
 Disneyland Resort line  2005 SelTrac CBTC/R UTO
 Hyderabad Metro Rail (Lines 1, 2, 3) 2017 SelTrac CBTC/R STO
 Incheon Subway Line 2 2014 SelTrac CBTC/R  UTO
 Istanbul Metro M4 Kadikoy-Kartal Line  2012 SelTrac CBTC  STO 
 Jacksonville Skyway ASE 1998 SelTrac CBTC UTO
 John F. Kennedy International Airport AirTrain JFK APM 2003 SelTrac CBTC UTO
 Kuala Lumpur Rapid Rail
 Kelana Jaya Line 1998/2014 SelTrac CBTC UTO
 Ampang Line 2015 SelTrac CBTC/R DTO/UTO
 Las Vegas Monorail 2004 SelTrac CBTC/R UTO
 London Docklands Light Railway 1995 SelTrac CBTC DTO
 Lewisham Extension 1999
 London City Airport Extension 2005
 Woolwich Arsenal Extension 2009
 Stratford Extension 2011
 London Underground
 Jubilee line 2011 SelTrac TBTC STO
 Northern line 2014 SelTrac TBTC STO
 Metropolitan, District, Circle, Hammersmith & City 2020 SelTrac CBTC/R STO
 Mecca Metro 2011 SelTrac CBTC UTO
 Newark Liberty International Airport AirTrain Newark 1996/2001 SelTrac CBTC UTO
 New York City Subway
 IRT Flushing Line 2016 SelTrac CBTC/R STO
 Ottawa O-Train Confederation Line 2018 SelTrac CBTC/R  STO
 Paris Metro Line 13 – Ouragan 2012 SelTrac CBTC/R DTO
 SFMTA Muni Metro (Market Street subway) 1997 SelTrac CBTC DTO
 Seoul Metropolitan Subway Shinbundang Line 2011 SelTrac CBTC/R UTO
 Shanghai Metro
 Line 6 2011 SelTrac CBTC/R STO
 Line 8 2011 SelTrac CBTC/R STO
 Line 9 2011 SelTrac CBTC/R STO
 Line 7 2010 SelTrac CBTC/R STO
 Line 11 2010 SelTrac CBTC/R STO
 Singapore MRT
 North South line 2017/2018 SelTrac CBTC/R DTO
 East West line 2017/2018 SelTrac CBTC/R DTO
 Tampa International Airport APM 1992 SelTrac CBTC UTO
 Toronto rapid transit 2008/10 SelTrac Speed/Signal Safeguard 
 Line 3 Scarborough 1985 SelTrac CBTC DTO
 Toronto streetcar electronic track switching system
 Vancouver TransLink SkyTrain
 Vancouver SkyTrain - Expo Line 1985  SelTrac CBTC UTO
 Vancouver SkyTrain - Millennium Line 2002 SelTrac CBTC UTO
 Vancouver SkyTrain - Canada Line 2009 SelTrac CBTC UTO
 Vancouver SkyTrain - Evergreen Line 2016 SelTrac CBTC UTO
 Walt Disney World Monorail 1989 SelTrac ATP Disney/TGI
 Washington Dulles Airport AeroTrain APM 2009 SelTrac CBTC/R UTO
 Wuhan Metro Line 1 2004/10 SelTrac CBTC DTO

SelTrac Incidents
 2019 MTR Tsuen Wan Line CBTC accident - no fatalities but two MTR staff sent to hospital for observations
 2017 Joo Koon rail accident - no fatalities but 38 injuries including 2 SMRT staff

References

External links
Official website
SelTrac technology
 Moving Block Why do we Need It

Railway signalling
Rapid transit