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

Route 28 had operated since 1947 between the Liberty Heights Avenue corridor and Cherry Hill with other destinations.

All buses that had operated from Cherry Hill and other locations in South Baltimore to Liberty Heights had been given the no.

But all buses that originated in the Liberty Heights area and had a final destination of Cherry Hill were designated no.

In addition, other trips operated between the Milford Mill Station and a community off Scotts Level Road in Pikesville known as "Bellemore Farms" (also previously a branch of Route M-13).

The line also had occasional short turns at Gwynn Oak Avenue and Buckingham Road.

[9] On August 30, 2009, the M-1 was renamed Route 52, completing MTA's redesignation of all M-lines to two-digit designations.