Winchester Street and Nahanton Street, as well as sections of Centre Street and Dedham Street, saw their final route 52 MBTA bus today, Friday December 20, as the second round of Better Bus changes takes effect on Sunday December 22. (Route 52 does not have weekend service.) The same number of trips will run as before, but all will be along the Parker Street / Wheeler Road route. There is no longer bus service convenient to the JCC, Wells Avenue, and other locations. This service along Winchester Street had operated since 1984.
More information can be found at https://mbta.com/projects/better-bus-project/52 and http://www.transithistory.org/roster/MBTARouteHistory.pdf (pages 188-189). The second link is especially interesting as it mentions former route 52 service including weekend service (first reduced in 1998, gone by 2012), service to Newton South High School (1973-1981), and service to Brighton Center (1987-2005/2010).
Also, although not advertised as part of the Better Bus program, good news for Newton Corner riders: a couple extra evening trips on Route 503 are added, effective Monday December 23.