The Baldwin factory in Philadelphia built their first locomotive in 1832. It was a copy of the British Planet class and had its share of teething problems. The buyer was reluctant to pay the full amount and Mattias Baldwin swore that it was to be their last engine. However 1861 saw the 1000th locomotive built and delivered to the Pennsylvania RR as number 212. This little 2-4 -0 tank engine featured 56 inch drivers and weighed 24 tons. I suspect it was used in commuter service.