The MMC rail line connected with the Mount Savage Railroad at the west end of the Narrows. After passing through the Narrows on the north side, it recrossed Wills Creek on a bridge (no longer present) just east of the present U.S. Route 40 bridge. Some of the tracks were still visible as of 1999 near some billboards, and a gas station. A picture of a classic wreck scene, circa 1860, shows that bridge collapsed into Wills Creek, with the engine "C.E. Detmold" hanging on. The original Potomac Wharf Branch bridge was a deck plate girder structure, with two support pillars in the creek. It was built in 1849, and rebuilt after the "Detmold" accident. It survived until a flood in 1936, and was not replaced.