# 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