PRR’s four-track Middle Division (Harrisburg to Altoona, Pennsylvania) was a favorite for photographers because of its accessibility, splendid scenery and a continuous parade of freight and passenger trains. PRR’s big boiler M1 Mountains were a standard mainline freight power from the mid-1920s until the diesels took over. The M1 shared the boiler used by the I1s 2-10-0 ‘Hippo’, where the I1s was intended for slow-speed drag freight work, the M1 was designed for relatively fast mainline running. These were good looking locomotives and made for great photos. Photo by John E. Pickett

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