Pittsburgh,_Allegheny_and_McKees_Rocks_Railroad
The McKees Rocks Industrial Railroad (reporting mark MRIE), formerly the Pittsburgh, Allegheny and McKees Rocks Railroad (PAM), was a switching railroad that served industrial complexes in McKees Rocks, Pennsylvania. It formerly served the Baltimore and Ohio Railroad (former Pittsburgh and Western Railway) yard across the Ohio River via a car ferry service, operated with the steamboat "Steel Queen".[1] [2]