This is a NKP class B-11a built by Alco-Brooks in October 1916. The 9 members of the class featured 57-inch (1.45-meter) driving wheels and were specifically designed to navigate tight industrial curves ranging from 18 to 30 degrees. They had 21x28-inch cylinders and a boiler operating at 180 psi. All were retired by March 1953 and eventually scrapped.
(colorized)
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