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 …

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 …

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 …

Nov 17, 2020 · This photo shows the PRR's huge S1 6-4-4-6 locomotive under construction right here in Altoona at the Juniata Shops in 1939. Nicknamed "The Big Engine," the S1 was the …

Sep 23, 2018 · The S-1 had a difficult time negotiating many curves on PRR’s vast network of tracks, particularly at speed. Eventually, it served only between the PRR’s Crestline, Ohio, …

The Pennsylvania Railroad Class S1 steam locomotive (nicknamed "The Big Engine") was a single experimental locomotive, the longest and heaviest rigid frame reciprocating steam …

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 …

Jul 25, 2018 · I have been collecting photos, models and learning these two mysterious engines for about two years (another one is S2 #6200 turbine). I searched every corner on the web, but …

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 …

Few locomotives made a public debut and statement like the Pennsylvania's "Big Engine" - the S1. Unveiled at the 1939 World's Fair, No. 6100 ran under its own power before crowds on a …