As additional information, as steam locomotives grew larger and larger, in the late 1930s thru the early/mid 1940s, the requirement for greater fuel and water supply became a VERY important design hurdle. Rectangular tenders were capable of carrying larger fuel (either coal or oil) and water quantities than cylindrical, i.e. Vanderbilt, tenders. Those large "square" tenders on the Southern Pacific GS and AC class locomotives carried 6000+ gallons of oil and 23,000+ gallons of water, and the Union Pacific pedestal/centipede tenders had at least 25,000 gallons of water.
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