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 - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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