[3] Prior to 1984, the area had been served by other bus and streetcar lines, most recently Route 28, which had branches feeding into Liberty Heights Avenue and then operating through Downtown Baltimore mostly to Cherry Hill.

The line has only had minor routing and schedule changes since its 1984 introduction, with the exception of two redesignations (in 1987 from R-3 to M-6 and in 2009 from M-6 to 57) and a controversial elimination in 2005 that was later reversed.

The main bus line serving Liberty Heights in both directions was Route 28.

While Route 28 operated in both directions, buses that had a final destination of Cherry Hill were designated no.

Route 28 would continue to serve the Gwynn Oak area outside of Metro's hours of operation until 2001.

Route 28 had three branches: one to Randallstown, one to various points on Security Boulevard, and one to Belvedere and Belvieu.

[8] In September 2001, Route 28 was completely discontinued when Metro connection services were introduced on Sunday.

MTA stated that Route 44 provided sufficient service, and only a small percentage of riders were negatively affected.

In March 2006, under extreme pressure from the community, MTA restored eight round trips on weekdays to Route M-6.

This change did not help the outgoing administration win re-election, but it did restore the line to its full-time, 7-day-a-week status.