As of January 2025,[update] the Toronto Rocket (TR) is the newest version of TTC subway trains and operate on Lines 1 and 4.
[4] Its design differs from its predecessors, which were formed by coupling sets of married pairs of identical cars.
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.
[7] By 2022, the TTC had decided that the next-generation of subway cars would have a design different from the T1 and TR fleets.
The initial procurement would consist of:[11] The contract would also include options for an additional 42 trains:[11] All units retired on July 24, 2023 (at the time of closure, four months ahead of schedule due to a derailment).