initiated. In September 1968, the 61 was changed to originate at Brighton Center, from where it ran through Oak Square and entered the Turnpike at Newton Corner. Route 62 Watertown-Copley was started at the same time. In June 1970, the routes were renumbered from 4, 61, and 62 to 304, 301, and 302 to reflect their express routings. (The 300-series numbers had been used by ex-Eastern Massachusetts Street Railway bus routes in Lawrence, briefly under MBTA control, in 1968). In March 1974, route 301 buses operating opposite the peak direction began using the pre-1968 routing on Cambridge Street. Inbound morning buses reverted to the Newton Corner routing in June 1974, but outbound afternoon buses continued to travel via Union Square. Some afternoon buses switched back to the Cambridge Street route in September 1976 and September 1978. All three routes had a number of minor changes to their downtown and Copley Square routings in the late 1970s and 1980s. Midday and Saturday service on the 302 began in January 1983; in December 1989, the midday and Saturday buses added a Copley Square stop as route 304 Watertown-Downtown via Copley. In September 1996, three routes were renumbered as the 501, 502, and 504. In January 2005, the 503 Brighton Center–Copley Square route was inaugurated. Inbound afternoon trips began operating via Cambridge Street in March 2014. Map References External links MBTA – Route 57 Watertown Yard–Kenmore Sta. via Newton Corner & Brighton Center Slideshow of Allston, showing some streetcar images with their modern-day counterparts along the route Green Line (MBTA) Railway lines opened in 1898 Railway lines closed in 1969