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For the list of integrated logistics support specifications, see S-Series of ILS specifications.
TTC UTDC ICTS Mark I 3012.jpg
An S1 train in its original livery leaving Lawrence East towards McCowan.
ICTS 3024 Interior.jpg
Manufacturer Urban Transportation Development Corporation
Family name ICTS
Constructed 1983–1986 [1]
Entered service 1985
Refurbishment 2015-16
Number built 28
Number in service 28 [1]
Formation 4 car trains (2 sets of semi-permanently mated pairs)
Fleet numbers 3000–3027 [1]
2 un-numbered test cars used for testing by UTDC
Capacity 30 seated,[1] 55 standing
Operator(s) Toronto Transit Commission
Depot(s) McCowan Yard
Line(s) served TTC - Line 3 - Scarborough RT line.svg 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
Power supply (?)
Electric system(s) 600 V DC third rail (linear induction)
Current collection method linear motors
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge

The S-series is the rolling stock of light metro trains used on Line 3 Scarborough of the Toronto subway system. They were built from 1983 to 1986 for the Toronto Transit Commission by the Urban Transportation Development Corporation (UTDC) in Millhaven, Ontario. They were based on the Intermediate Capacity Transit System (ICTS) Mark I model of trains. The line first operated with two-car units, and later as four-car units as ridership grew. A test run began in 1984 and full service began in 1985. The fleet numbers of the cars used are 3000 to 3027.

Identical trains are used by the Vancouver SkyTrain and the Detroit People Mover. However, unlike these systems which are fully automated with no human operator onboard, the TTC employs a single operator to steer S-series trains along with Line 4. Toronto subway trains on Line 1, Line 2, on the other hand, carry two personnel onboard (an operator and a guard) while in service.[2]

Since the retirement of the remaining H-series trains in 2014, the S-series trains have been the oldest in operation on the system. They are the only rapid transit trains owned by the TTC with painted livery since the G-series trains. The trains used to have a unique logo of a lower-cased "RT", referring to the line's original name, Scarborough RT. Since 2015, the cars have been undergoing refurbishment and repainting to prolong their lifespan until at least 2023. The new exterior of each car features a blue-finish (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.