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Yes, ALCo did design all of its own locomotives. The engines ALCo used were the 330, 531, 538, 539, 244, & 251. 330) an early engine used on a handfull of early switchers: max. HP 300 531) used on the HH600 and HH900 models, 2 versions 531: max. HP 600, 531T: max. HP 900 538) the 531 was modified in 1938 to produce higher horsepower, thus becoming the the 538, used on the HH660 and HH1000, max. HP 538: 660 538T: 1000 539) the 538 was modified in 1939 allowing it to be depressed in the frame of a locomotive, same specs as the 538 used in the S-1, S-2, S-3, S-4, and RS-1 plus the S-7 and S-10 built by MLW 244) introduced in 1944 max HP: 2400 in a 16 cylinder configuration, not a very sucessful engine, it had a few flaws, and it was costing ALCo a fortune providing warentee work on the engines, so ALCo devoloped the 251. 251) (introduced in 1951) combining the best aspects of the abandoned 241 and flawed 244 designs the 251 was one of ALCos most sucessful engines, max. HP: 4000 in an 18 cylinder configuration. All of ALCos engines were four cycle engines. I'm not quite sure how efficent ALCos engines were. 330, 531, 538) switchers only 539) swichers and one road switcher model (the RS-1) 244) road switchers only 251) road switchers and switchers hope that helps
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