Duplex locomotive - photos

[Altair]

Wikipedia: A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame.

Cylinders and driving wheels on a Pennsylvania Railroad S1-class locomotive.


The lone Pennsylvania Railroad S1.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg



Previously:

Machining a locomotive coupling rod in the 1930s - photo
Steam locomotive conjugated valve gear animation - GIF
Walschaerts locomotive valve gear operation - video

[DIYSwede]

The engineers in the early Soviet Union were a pretty wild bunch before the purges: "Steam-Diesel Locomotives"



Rare movie of this beast, including a mandatory speech of the Peoples' Commissar for Railroads, Lazar Kaganovich
(who was a man of action, not merely words: https://en.wikipedia.org/wiki/Lazar_Kaganovich
"During his time serving as Railways Commissar, Kaganovich participated in the murder of 36,000 people by signing death lists. Kaganovich had exterminated so many railwaymen that one official called to warn that one line was entirely unmanned."
From S S Montefiores monography "Stalin: The court of the red czar"...

The non-proliferation of these simple, self-evident constructions were of course due to contra-revolutionary work by Enemies of the People/ Party!

More info on this page:
Russian Reforms- Unusual Russian Locomotive Technology.