Route 54 is a bus route that operates in Baltimore and its suburbs, serving the corridors of Park Heights Avenue, Milford Mill Road, and Liberty Road. All trips operate from the Penn-North Metro Subway Station in Baltimore City to the Milford Mill Metro Subway Station in Pikesville. From there, about 50% of trips continue to Randallstown. The route, which started operating on August 24, 2008, is a combination of the most recent versions of the former routes M-3 and M-8, which had been operating since 1984 and 1987 respectively. Prior to these dates, the routes had been served by other buses and streetcars.