 3 Baynesville to downtown bus resembling today's service began in 1956, when the no.3 line absorbed the service of Route 45, which operated between Waverly and Baynesville since 1949.In 1959, the line was combined with the Halethorpe Streetcar Line (known as Route 12 in its final days) and extended to Halethorpe along the Wilkens Avenue corridor, where it served St. Agnes Hospital and UMBC.