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.

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. A set of four 84 in (2.13 m) drive wheels followed, trailed by …

Nov 17, 2020 · The Pennsylvania Railroad (PRR) T1 6110 was one of the two initial prototypes of the T1 class¹. This masterpiece was produced by the Baldwin Locomotive Works in 1942. The T1 6110, along with its sister prototype, was designed for fast passenger service across the Pennsylvania Railroad's lines.

Only one was produced, the Pennsylvania Railroad's sole class S1 of 1939. It was a duplex locomotive, the longest and heaviest rigid frame reciprocating steam locomotive ever built and is referred to as the Pennsylvania Type.

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 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.

Sep 23, 2018 · So, it should come as no surprise that the PRR constructed one of the largest and most powerful passenger steam locomotives ever built, the S-1.

Star designer Raymond Loewy provided the locomotive with streamlined Art Deco-style cladding and, including the eight-axle tender, reached a total length of more than 140 feet. Since they no longer fitted on the turntables, the PRR built special track triangles (wyes) for turning.

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.

Both S class locomotives were originally intended to only have four leading and trailing wheels, but for the S1 increases in weight required an additional axle at each end. In the case of the S2, it was due to wartime limits on the use of advanced steel alloys.