Aveling & Porter Road Roller at the Ford Junction Aerodrome at Sussex, England in 1918. I found this steamroller in the corned of a US Army Signal Corps photograph at the National Archives [public domain image]. Does anyonje have any information about this engine? Is 'Triumph' the name of the engine or a model identifier?
https://www.flickr.com/photos/ssave/46050579562/in/photostream/