"Conceived and built in 1930 by the German rail company Deutsche Reichsbahn, the Schienenzeppelin was a design alternative to the streamlined steam locomotives of its day. It was a slick and relatively lightweight at 20 tons, running on but two axles and powered by a 46-liter BMW V-12.
The same engine was later used to power the light bombers of the Luftwaffe. The engine sent 600 horsepower to a massive ash propeller, tilted seven degrees to produce downforce. It was one of those designs that would shock and delight even in these times, when aluminum is used not for Bauhaus trains but for high-revving V-8s and computers from the near future."
When I showed this pic to our "rail buff" son, he recognized it immediately as a probable colour pic, converted to black and white. He took almost the same shot when he visited the railway museum in Montreal a few years ago.