Jul 5, 2018 · The new locomotive was designated as the S1 class, and PRR collaborated with the American Locomotive Company, the Baldwin Locomotive Works, and the Lima Locomotive Works in designing and building the engine. The S1 was built in PRR’s Altoona Works in Altoona, Pennsylvania during 1938.

Nov 17, 2020 · The first experimental duplex on the PRR was the S1, a huge rigid frame duplex locomotive of the 6-4-4-6 wheel arrangement. This engine was over 146' long! This locomotive was built by the PRR at Altoona in 1939; it was hailed as the largest locomotive ever built.

Dec 24, 2023 · This O scale model of the S1 was built from plans submitted to Ed Alexander whilst the 12" to the foot model was being built . Both model and real engine were on display at the 1939 NYC World Fair lettered " American Railroads" . Alexander would make 2 additional S1's for the PRR one being displayed at the 1939 Treasure Island fair in San ...

Jan 10, 2025 · PRR 6100, S-1, 1939 : Description: WB. Here is an image of an official photo that was taken in Altoona, Pennsylvania, in 1939. Shown here in the Pennsylvania Railroad's Erecting & Machine Shop is engine #6100, the S-1 (6-4-4-6) "Big Engine" built in Juniata during January of 1939 and retired in January of 1949 after just ten years of service.

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.

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. The S1 was...

The PRR S1 class steam locomotive was a single experimental duplex locomotive of the Pennsylvania Railroad. It was designed to demonstrate the advantages of dup...

Sep 11, 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 …

Since they no longer fitted on the turntables, the PRR built special track triangles (wyes) for turning. Despite the bogies that could be moved laterally by 2.25 inches, it soon became clear that the S1 had a tendency to derail not only in many curves, …

Mar 20, 2023 · The PRR S1 is a most impressive locomotive, in either prototype or model form. In both cases it presents problems on where it can be operated. As a model it requires a very large minimum radius, something like 48”. The problems are both the long wheelbase and overhangs.