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My favorite locomotive, the Pennsylvania Railroad S1
(hexbear.net)
I know I've made posts about this locomotive before, but just look at it. It is the best-looking locomotive ever made. While it never officially broke the world record for speed, there are rumors, the fastest of which was rumored to be 152mph, leaving the Mallard speed record of 126mph far in the dust. While I doubt that actually happened, doesn't it look like this train could keep that pace?
https://en.wikipedia.org/wiki/Pennsylvania_Railroad_class_S1
Extremely cool train!