Hello O scale world ...before Lionel's PRR B6 Switcher,...there was the Pratt...in glorious 17/64ths scale . Cast bronze boiler and tender puts this in a heavy weight category. Outside 3rd rail...., hand of God reverse, priced as a kit above Lionel's RTR example. Offered 1938-40. Here shunting a Bristol board scratch built PRR P70 coach also 17/64ths ..mid 30's.
check out action packed video link