31. The fare mezzanines and staircases were reconfigured over the years as streetcars were replaced by trackless trolleys and later buses. 32. As built, many of the key rapid transit transfer stations were trackless trolley operation; other such spaces have been closed. 33. Diesel buses temporarily replaced trackless trolleys on route 75 in June 2002, but trackless service was restored in April 2008. 34. Buses replaced trackless trolleys on the 22 on April 6, 1962, running as the 22 Ashmont-Dudley via Talbot and Warren. 35. The Harvard Bus Tunnel also opened in 1912, originally serving streetcars but now buses and trackless trolleys ( trolleybuses ). 36. The trackless trolleys ( or trolleybuses ) replaced trolley cars ( streetcars ) on the route on in June 25, 1950. 37. Buses started running on the 15 Kane Square-Dudley via Uphams Corner and Dudley Street on April 6, 1962, replacing trackless trolleys . 38. In 1958, the Harvard Square tunnel routes were replaced with electrically powered trackless trolleys , which were the only such MBTA routes. 39. The Many transit operators removed some streetcar tracks but kept the electric infrastructure so as to run electrified trackless trolley buses. 40. Unlike the buses, MBTA trackless trolleys are specially equipped with a wide left-side door, to ease faster boarding in the tunnel.
