The Baltimore Terminal Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of Maryland.
The branch had a rail yard and terminal that was used for shipping coal and bulk minerals, and later for grain and merchandise.
In 1875 new roundhouses were built at Bailey's (Ostend Street, near the site of the present-day M&T Bank Stadium) and Riverside Yard on Locust Point.
The B&O built two larger roundhouses at Riverside in 1907 (totaling 50 stalls) and no longer used the Bailey's facilities for locomotive operations.
The B&O operated a car float across the Baltimore harbor to bring trains from Philadelphia to connections at Locust Point and to the south and west.
To move trains more efficiently around the city it also built the Baltimore Belt Line and the Howard Street Tunnel during 1891 to 1895, at considerable expense.
This became the second of two Baltimore stops for the Royal Blue passenger train, which began service in 1890 between Washington and New York City.
Passenger traffic declined significantly after World War II and the B&O closed the Mount Royal station in 1961.