and soon all trains operated to Riverside. The yard at Riverside was expanded from June 1960 to January 12, 1961, with additional storage tracks and maintenance facilities to meet the additional demand. The signals were also adjusted to allow for two-minute headways on the whole line. Initial fares were 20 cents for all rides –substantially lower than the previous B&A fares. This was adjusted in 1961 as part of a systemwide fare change, with 40-cent fares west of Reservoir and 30-cent fares at Reservoir through Longwood. Riverside service initially ran to ; it was extended to (except on Sundays) on November 20, 1961. The MBTA takes over The Massachusetts Bay Transportation Authority (MBTA) replaced the MTA in August 1964. The streetcar routes entering the Central Subway were designed as the Green Line on August 26, 1965. Sunday service was extended to Lechmere on September 10, 1966. In 1967, the five remaining Green Line branches were given letter designations; the Riverside Line became the D branch. The tracks were rebuilt in the mid-1970s to prepare for the new Boeing light rail vehicles. From September 8 to December 28, 1973, buses replaced streetcars between Newton Highlands and Riverside. A temporary loop was built at Cook Junction to turn the single-ended PCC streetcars. (The loop track were later reused by the Seashore Trolley Museum.) From June 8 to September 11, 1974, buses ran between Kenmore and Reservoir while the inner portion of the line was reconstructed. A temporary loop was used near Reservoir station, allowing D branch trains to use the C branch between Reservoir and Kenmore. (On March 5, 1974, the downtown terminal was cut back from Lechmere to North station to accommodate the longer running times associated with this rerouting.) From September 28, 1974 to September 20, 1975, single-tracking took place between Cook Junction and Reservoir. Station platforms were also rebuilt during these shutdowns. A new maintenance facility at Riverside was opened on July 12, 1976, to serve the new LRV fleet. The MBTA's first LRVs operated on the D branch on December 30, 1976. The downtown terminal was changed several times in 1976–77; PCCs and LRVs sometimes used different terminals (as LRVs could use stub-end tracks, while PCCs required a loop). On December 15, 1977, all D branch trains running with LRVs began using the newly rebuilt Canal Street surface terminal at North Station; the small number of PCCs continued