Duplex locomotive - photos

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.
https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg

The lone Pennsylvania Railroad S1.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ocomotive1.jpg


Previously:

https://www.homemadetools.net/forum/...953#post171668
https://www.homemadetools.net/forum/...444#post131719
https://www.homemadetools.net/forum/...941#post167937

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

Attachment 39569 Attachment 39570

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"...


https://www.youtube.com/watch?v=W0CIgfB1ey4

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.