Northern Pacific steam locomotive 2650 at Chicago, Illinois in 1934. Number 2650 is a class A-2 built by Baldwin in 1934 J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Penn Central Railroad diesel locomotive 4021 at Chicago, Illinois on August 28, 1972. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Penn Central Railroad diesel locomotive 4084 at Chicago, Illinois on August 28, 1972. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Penn Central Railroad diesel locomotive 4310 at Chicago, Illinois on August 28, 1972. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Penn Central Railroad diesel locomotive 4319 at Chicago, Illinois on August 28, 1972. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Penn Central Railroad diesel locomotive 5892 at Chicago, Illinois on August 28, 1972. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

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Photographs of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail systems.