The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental duplex locomotive of the Pennsylvania Railroad. It was designed to demonstrate the advantages of duplex drives espoused by Baldwin Chief Engineer Ralph P. Johnson. [1]

Jul 5, 2018 · The PRR S1 was a unique duplex locomotive that utilized a 6-4-4-6 wheel arrangement. A six-wheel leading truck with 36 in (.91 m) wheels was positioned at the front of the engine.

One of the most famous locomotives to be built at the PRR shops is Pennsylvania Railroad’s only member of the S1 class, #6100. It had a short but interesting life! It’s a story railfans still talk about. #6100 pulls out of Union Station in Chicago with the Manhattan Limited in February 1943.

The Pennsylvania Railroad's lone S1 was the only 6-4-4-6 ever constructed. A 6-4-4-6 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, is one with six leading wheels, two sets of four driving wheels, and six trailing wheels.

Passenger locomotive design run wild was the S1. Chris Hohl pointed Locobase to a previously unknown (to Locobase at least) collaboration between the Pennsy and American Locomotive Company, Baldwin, and Lima to design this engine. It was built in time for the 1939 New York World's Fair, where it was displayed on a treadmill operated by its own ...

Sep 23, 2018 · Instead of immediately pressing the S-1 into service, PRR sent it to the New York World’s Fair. As the highlight of a display of American railroading, the streamlined, bullet-shaped S-1 was placed on a set of rollers powered by the tractive force of the big engine.

Nov 17, 2020 · Nicknamed "The Big Engine," the S1 was the longest reciprocating steam locomotive ever (just over 140 ft); it was too big for many PRR curves. Along with wheel slippage, this limited the S1's usefulness.

The Pennsylvania Railroad Class S1 steam locomotive (nicknamed "The Big Engine") was a single experimental locomotive, the longest and heaviest rigid frame reciprocating steam locomotive ever built. The streamlined Art Deco styled shell of the locomotive was designed by Raymond Loewy.

Jan 5, 2023 · Detail of the cylinders and driving wheels of Pennsylvania Railroad S1 6–4–4–6 steam locomotive at the New York World’s Fair, July 15, 1939. Original uploader was Morven at English Wikipedia.

The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental locomotive, the longest and heaviest rigid frame reciprocating steam locomotive ever built. The streamlined Art Deco styled shell of the locomotive was …