The line currently runs from the Rogers Avenue Metro Subway Station to the Patapsco Light Rail Stop, serving the communities of Arlington, Ashburton, Mondawmin, Rosemont, Baltimore, Cherry Hill, and Mt.

Auxiliary Bus Lines also operated a separate route along Hollins Ferry Road in Baltimore Highlands.

[4] In 1984, in conjunction with the opening of the Baltimore Metro Subway, the route was modified to serve three stations, with its northern terminus extended from Belvedere and Groveland Avenues to Rogers Avenue Station.

Another plan was introduced to extend the route north to the Reisterstown Plaza Metro Subway Station to replace a portion of Route 27, which was proposed for elimination, and eliminate some of the deviations into other Metro stations in order to keep the operating time the same.

The elimination of Cherry Hill trips was scrapped due to public outcry, and all changes to this route are yet to be implemented.