5
The 5 City Point - McCormack Housing via Andrew Station leaves the City Point area via East Broadway and Dorchester Street to Andrew. After passing through the Andrew busway, 5 buses run east on Preble Street and south on Old Colony Avenue, ending at McCormack Housing.
The number 5 was assigned to the Fish Pier (Northern Ave.)-South Station via Summer St. route until June 1968, when it was combined into the 6 and 7 due to the closure of the Summer Street overpass. The current route was started in 1977, after a 1975 experimental route between Broadway and Copley (replaced by an extension of the 9). The current 5 was originally known as 10A, being the same as 10 east of Andrew.
Read more about this topic: MBTA Bus Routes In South Boston