HO Smoke, PRR S1 6-4-4-6 Duplex, #6100, Paragon4 Sound/DC/DCC

Nicknamed “The Big Engine”, and appropriately so, the PRR S1 was a experimental duplex locomotive of the Pennsylvania Railroad. It was designed to demonstrate the technological advantages of the duplex drive wheels. It was recognized as having the longest (140 ft 2 ½ inches) and heaviest (608,170 lbs.) rigid from reciprocating steam locomotive ever built. It was numbered 6100.