Covered Wagon Quartet Over The Potomac. While heading to Mobile, Alabama, Norfolk Southern Train 956 led by F9A NS 4270 (née-Baltimore & Ohio 937, F7A, EMD, 1/1952) crossed the Potomac River from Sharpsburg, Maryland to Shepherdstown, West Virginia on June 3, 2011 on a beautiful sunny day. The 1904 built former Norfolk & Western Potomac River Railroad Bridge carried passenger trains along side freight until the end of passenger service in 1957. During the administration of CEO Wick Moorman, for over a decade the famed NS F-units would be synonymous with the numerous Office Car Specials operated by the railroad all over the 22-state system until they were sold in 2019.