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Known as the Velocipede, these bikes were used on the railroad for track inspectors and many other employees. This was a great great step grandfather inspecting the rails on the Pennsy in the late 30's. The original picture was printed backward but due to technology today I was able to investigate and flip it correctly.
First day on Shorpy so I looked for anything local that I could help identify. I'm from Akron, so Hudson is very close by, but thanks to Waymarking.com, I don't even need to hunt this down or take current photos--they already have it photographed and geotagged here.

There is or was a similar machine at the Casey Jones museum at "The old country store" in Jackson, TN. I bet it gave the inspector's upper body a nice workout, especially if he heard an approaching locomotive behind him.
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