Boy oh Boy. This is a good one. Checked several dynamic sites and boiler groups, and TRAINS magazine site. General opinion is steam engine will maitain its efficiency at low or high. When the atmosphere is too thin for good complete combustion, that is when they start to loose. Diesels are a whole different kettle of fish. Yes the higher they go they start to starve. They need turbos just to get up there. In really high railroads like in South AmericA the diesel engines needed to be pushed by the old steam locomotives just to move a few cars. After the design engineering people really put some big equipment on the front of those diesels did they get some performance out of them. Same as WWII with super high altitude fighters and bombers. With out superchargers they were worthless low level escorts. On this subject go on line and do some reading. Lots of yes and no and what if.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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