Stansted Airport Transit System
| Company type | Automated people mover |
|---|---|
| Industry | Transportation |
| Founded | 1991 |
| Headquarters | London Stansted Airport , United Kingdom |
Area served | London Stansted Airport |
| Products | Automated people mover service |
| Owner | Stansted Airport Limited |
The Stansted Airport Track Transit System (TTS) is an entirely automated people mover functioning within London Stansted Airport, located in England, United Kingdom.
This transit system facilitates passenger movement between the central terminal and the remote departure and arrival gates housed in satellite buildings 1 and 2. Operating solely on the "airside" zone, it exclusively serves travelers who have cleared security checkpoints. The electric-powered transit offers complimentary rides, is equipped for disabled access, and presents a more sustainable alternative to the diesel buses utilized elsewhere on the airport grounds.
Commissioned in 1991, the TTS consists of a single line with three stations spanning roughly 2 miles. Its fleet includes Adtranz C-100 and CX-100 vehicles powered by a central third rail. Handling an estimated 36,000 passengers daily, the system accommodates around 11.5 million passengers annually. Management of the service falls under Stansted Airport Limited.
As part of ongoing airport redevelopment efforts, plans are in place to retire and partially dismantle the TTS during winter 2026. Pedestrian bridges will replace it to facilitate the expansion of the terminal.
History
The Stansted Airport Transit System was inaugurated in 1991 by the British Airports Authority (BAA) amid a redevelopment project that introduced satellite terminals separate from the main building. After considering alternatives such as moving walkways and bus connections, BAA opted for an automated guided transit system. In 1998, the network was extended with a new underground station serving a second satellite terminal.
Guideway
The TTS runs on a dual-track guideway measuring , connecting the main terminal with two satellite terminals. The alignment begins on an elevated structure adjacent to the departure lounge before descending into a tunnel beneath the airport apron. An elevated maintenance facility is situated at one end of the guideway.
Stations
There are three stations within the system: Terminal (featuring separate boarding areas for arrivals and departures), Gates 1–19 (Satellite 1), and Gates 20–39 (Satellite 2). Satellite 3 (Gates 40–59) is not served by this transit system but is linked via a pedestrian walkway. Each station incorporates distinct platforms for boarding and alighting to enhance passenger circulation, with all boarding platforms equipped with platform screen doors.
Vehicles
The rolling stock includes five Adtranz C-100 cars produced by Westinghouse Electric Corporation, with bodies constructed by Walter Alexander Coachbuilders in Scotland before final assembly in Pittsburgh. This fleet expanded to nine units following the addition of four Adtranz CX-100 cars during the 1998 extension. Typically, eight vehicles are deployed to sustain a reliability rate of 99.98%. Trains operate as single-, double-, or triple-car formations and provide full accessibility for disabled passengers. The fully automated, driverless system operates at Grade of Automation level 4 and is overseen by the Office of Rail and Road. Notably, Stansted’s TTS remains the last operational APM worldwide utilizing Adtranz C-100 vehicles.
Planned closure
In April 2023, Manchester Airport Group, the proprietor of Stansted Airport, revealed the Airport Route 43 initiative aimed at expanding the airport. A significant element of this project involves discontinuing the Stansted Track Transit System (TTS) by winter 2026.
The choice to phase out the TTS was influenced by its aging infrastructure and operational constraints. Originally constructed in the 1980s with an anticipated service life of 20 to 25 years, the system has surpassed its expected duration. Critical components—such as the vehicles, track infrastructure, power supply, software, communication networks, fire safety mechanisms, station doors, and various safety systems—have become outdated and are no longer supported by manufacturers. The cost of fully replacing the system was considered financially unfeasible. Moreover, the TTS contributed to congestion issues by delivering large groups of passengers simultaneously to border control checkpoints.
After its closure, the TTS track beneath the current canopy will be dismantled; however, other track segments, structural supports, and maintenance facilities will remain intact but will not be operational. The strategy is to substitute the TTS with pedestrian Sky Link bridges that will facilitate passenger movement to boarding gates. During the construction phase, passengers will be transported by buses, which will result in longer transit times. On 31 October 2023, Stansted Airport secured planning approval to expand its terminal and retire the TTS.