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Monongahela Railway - Wikipedia
Monongahela Railway, " The Biggest Little Coal Carrier - American-Rails.com
Monongahela Railway Company Photographs - Historic Pittsburgh
Monongahela Railway 73 - PA Trolley Museum
The Monongahela Incline
Monongahela Railway Company Photographs | Digital Pitt
Conrail merger family tree | Trains Magazine
Ex. Monongahela Railway - 1999/2000 - Lundsten
Pittsburgh and Lake Erie Railroad - Wikipedia
Monongahela Railway No. 67 - The Historical Marker Database