Friend of mine has some photos taken of a 2-6-2 twofoot locomotive that was in Monroe Wa back in the 80’s maybe early 90’s? It was a 2-6-2 from WWI that the USA used, originally looked like this “http://upload.wikimedia.org/wikipedia/commons/8/89/PuffingBilly8A.jpg”. Now he cut the cab and made it bigger an more american looking, took the side tanks off and built a 4wheel tender for it (used speeder wheels) This thing looked AWESOME! How he built it, it looked like it should be on the Rio Grande Southern. He also had some little Plymouth and 2 or 3 coaches (also used speeder car wheels on coaches) just some really cool stuff, just wanted to know if anyone knew where it might be. I will see if I can scan his photos and put them up, and I think there is a small part in the book “Narrow Gauge to No Man’s Land - US Army 60cm… by Richard Dunn”.
Looking at the phot you’ve posted, I suspect that what the engine is is what was referred to during World War One as a Trench Engine: (aka. Tin Turtles, for the armored locomotives). Both the Allies and the German’s employed railways to distribute stores and amunitions.