The Toronto subway system's rolling stock consists of 880 subway cars for Line 1 Yonge–University, Line 2 Bloor–Danforth, and Line 4 Sheppard. The rolling stock is owned and maintained by the Toronto Transit Commission (TTC).

Subway trains

All active TTC subway cars are equipped with flip-up seats located in each car (near the operator's cab), which can accommodate mobility devices such as wheelchairs, strollers, scooters, and bicycles. The new Toronto Rocket trains have two designated areas in each car with automatic flip-up seats, and high-level platforms allow access to all cars.

Toronto Rocket

The Toronto Rocket (TR) is the newest version of TTC subway trains, which is operated on Lines 1 and 4. Its design differs from its predecessors, which were formed by coupling sets of married pairs of identical cars. The trains consist of six cars for Line 1 and four cars for Line 4, both of which are connected with open gangways, similar to Bombardier's Movia family of metro trains. They only have two full-width operator cabs per trainset (as opposed to one on the right-hand corner of every subway car on the older versions), greater accessibility options and the skin of the train is welded rather than the previously used riveting method. The TRs' exterior front and rear destination and train run number signs are outfitted with digital orange LED boards, while all previous TTC train models use back-lit roller signs. The first of the new TR trains was scheduled to be delivered in late 2009, but in early 2010, TTC officials stated that the new trains would not enter service until late 2010. The first train arrived on TTC property in October 2010, and entered revenue service on July 21, 2011.

Next-generation cars

By 2022, the TTC had decided that the next-generation of subway cars would have a design different from the T1 and TR fleets. Like the TR fleet, riders would be able to walk the full length of the interior of the new trains. Like the T1 trains and unlike the TR fleet, the new trains would consist of three coupled pairs. Only the two end cars of the new trains would have cabs; cab-less cars would have hostler controls to allow the independent movement of cab-less pairs within work shop areas. In April 2024, a TTC staff report recommended ordering 80 new trains, 55 to replace the T1 fleet on Line 2 and 25 for Line 1. The estimated cost of the new trains was at $3.23billion with the earliest delivery being in 2030, four years after the lifespan of the T1 fleet. In July 2024, TTC CEO Rick Leary reported that the TTC would launch procurement for 70 new trains, pending funding from the federal government. The initial procurement would consist of: The contract would also include options for an additional 42 trains:

Line 3 Scarborough trains

All units retired on July 24, 2023 (at the time of closure, four months ahead of schedule due to a derailment).

Work vehicles

Most subway work cars are painted yellow with the fleet number as RT-##. The exception are converted passenger cars, which have a yellow stripe added and the RT fleet number replaces the former fleet number.

Track gauge

The TTC uses two different track gauges: