I found probably the only footage of a Pennsylvania S1 steam locomotive. The locomotive is Pennsylvania 6100, the only S1 built, which is probably why it's so rare to find video footage of one. The S1, know by it's crew as "The Big Locomotive" had a top speed of over 150mph, but never went that fast do to speed limits and possiblity of derailment. The S1 had a strange wheel arrangement of 6-4-4-6 and was longer than the Union Pacific 4-8-8-4 Big Boy Class. It was hard to maintain, and wheel slips were common. Only one was built. It was built in 1939 and was scrapped in 1949. It only ran for 7 years before being retired in 1946. (Note: I do not own this footage. Found it in a documentary by Green Frog Videos.)

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