S-series (Toronto subway)
|Manufacturer||Urban Transportation Development Corporation|
|Number in service||28 |
|Formation||4 car trains (2 sets of semi-permanently mated pairs)|
|Fleet numbers||3000–3027 
2 un-numbered test cars used for testing by UTDC
|Capacity||30 seated, 55 standing|
|Operator(s)||Toronto Transit Commission|
|Line(s) served||Line 3 Scarborough|
|Car body construction||Aluminum|
|Car length||41 ft 8 in (12.70 m)|
|Width||8 ft 2 in (2.489 m)|
|Doors||4 sets (2 sets per side) per car|
|Maximum speed||70 km/h or 43 mph|
|Weight||34,050 lb (1,840 kg)|
|Traction motors||3 phase AC linear motors|
|Power output||120 hp (89 kW)|
|Transmission||3 phase AC linear motor|
|Electric system(s)||600 V DC third rail (linear induction)|
|Current collection method||linear motors|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
The S-series is the series of rapid transit rolling stock used on Line 3 Scarborough, part of the subway system of Toronto, Ontario, Canada. They were built from 1983 to 1986 for the Toronto Transit Commission (TTC) by the Urban Transportation Development Corporation (UTDC) in Millhaven, Ontario. The trains use UTDC's proprietary linear motor-based Intermediate Capacity Transit System (ICTS, now branded as Bombardier Innovia Metro) and are its Mark I model, which is also used by the Vancouver SkyTrain and the Detroit People Mover. They consisted of 14 married pair sets with fleet numbers 3000 to 3027, and are not compatible with the trains on other lines, which use conventional motors.
Test runs took place in 1984 and full service began in 1985. When the line opened, 12 sets operated individually as two-car units. In 1986, two more sets were added, allowing sets to be coupled to form four-car units as ridership grew. All trains operate on a automatically without human intervention. Although they are capable of unmanned operations, as in Vancouver and Detroit, the TTC opted to use one-man operation on all trains, a practice which was later used on heavy-rail Toronto Rocket sets on Line 4 beginning in 2016. Trains on Line 1, Line 2, on the other hand, carry two personnel on board (an operator and a guard) while in service.
Since the retirement of the remaining H-series trains in 2014, the S-series trains have been the oldest in operation on the entire subway system. They are also the only TTC rapid transit trains with a painted livery since the G-series, consisting of a unique lowercase "rt" logo, referring to the line's original name of "Scarborough RT". Since 2015, the cars have been undergoing refurbishment and repainting to prolong their lifespan until at least 2023 while the Scarborough extension to Line 2 is under planning. The new exterior of each car features a vinyl wrap with a blue livery (the line's colour on route maps), the Line 3 symbol, and the names of the line's six stations written on the top edge on both sides, in an effort to promote the line as a whole.