Maryland Midland Railway
Reporting mark: MMID
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MMID - MD550 Overpass (Frederick County, Maryland)
Pony/through plate girder bridge over MD-550 on Maryland Midland Railway
MMID - Monocacy River Bridge (Frederick County, Maryland)
Built for WM RwyBaltimore through truss bridge over Monocacy River on MMID (former WM)Open to traffic
MMID - Tuscarora Creek Bridge (Frederick County, Maryland)
Pony/through plate girder bridge over Tuscarora Creek on MMID (former PRR)Open to traffic