Terminals 2 and 3 and between Terminal 3 main building and South Pier, and a PMS/North that provides services between Terminals 1, 2 and 3 on both the landside and airside. The system use a bypass shuttle for services between Terminals 2 and 3 and single-lane shuttles for the rest of the system, with both the landside and airside having their own lanes. The system consists of seven stations (A-South, A, B, C, D, E and F), each giving the name of the nearest boarding gate for easy recognition for passengers. The Main Operation Control Center is located inside the maintenance office near A-South Station and the Standby Satellite Control Center is located in the center of the Terminal 3 building. Either of the control centers can be used to control the entire system. Rolling stock Adtranz C-100 Initially, the Skytrain rolling stock consisted of Adtranz C-100s, jointly built by Westinghouse and Adtranz (acquired by Bombardier). Although stations were designed to accommodate two-car trains, the C-100 trains operated in single units, without a second carriage per train, and the two innermost platform screen doors of each station were for emergency purposes (the trains stopped at the outer half of each station, with two doors on each half). Mitsubishi Heavy Industries Crystal Mover In 2002, work began on a new S$135 million Mitsubishi Crystal Mover-based system to accommodate the planned opening of Changi Airport Terminal 3 and the projected increase in demand as the airport expanded. During the upgrade, the existing C-100 system continued operations on one of the tracks while the other was upgraded from December 2004 to 16 March 2006, after which the latter resumed operations while the former was closed for upgrading. Full operations finally began in November 2007 when the lines serving Terminal 3 opened. Overview Mitsubishi delivered 16 Crystal Mover vehicles to Singapore Changi Airport, ten of which are allocated to PMS/North and six to PMS/South. Five different designs with innovative external face images derived from the original Crystal Mover design were proposed to Changi Airport, with the final vehicle design being awarded the Good Design Award in 2006. The Crystal Mover was also designed for flexible response to a variety of operations, from a one car operation to multiple coupled-car operations, depending upon the system requirements; this is seen in the use of dual-car operations for PMS/North landside and PMS/South, single-car operations for PMS/North airside