 In planning the route of the Old Main Line, the B&O decided against building the main line directly through Frederick, preferring instead to take advantage of a valley grade to the south of the city.The city's first train station, built in 1832 at South Carroll Street, was the B&O's second oldest permanent station, and was used mainly for freight.A new passenger depot was built in 1854 at East All Saints and Market Streets, and the old station continued as a freight station until circa 1910.