Bus companies generally listed in the July 1942 Russell's Guide or the 1952 Mass Transportation's Directory, and their predecessor and successor companies. This list is somewhat arbitrary and provides a general overview.
Eastern Shore Transit Co. - operated until 1952 (to Carolina Coach Co./Carolina Trailways)
Original route: Salisbury MD-Cape Charles
Emery's Motor Coach Lines - operated until 1949
Original route: Cumberland-Keyser-Piedmont
Trailways member (Metropolitan Trailways) 1947-1949
Maryland Coach Co. - operated until 1954
Original route: Baltimore-Hanover PA
1947-1954 was McMahon Transportation Co.