sentences:  The TTC provides Wheel-Trans, a door-to-door accessible transit service, to registered clients who are unable to use the conventional transit system.In some cases, Wheel-Trans buses connect customers from their homes to accessible subway stations allowing the rider to use the conventional system for a portion of their journey.The service was created in 1975 as the challenges for people with accessibility needs became more public, and at a time where the entire surface system ran high-floor vehicles which were inaccessible, and subway stations did not have elevators.