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The RS-3 was a 1600 hp Road Switcher built from 1949 to 1956, it had the Alco 244 engine. This engine damaged Alco's reputation for good locomotives due to its many crankshaft failures. This engine started off in mainline service and eventually ended up in yard service on a lot of railroads. The RS-11 (482 units) was an 1800 hp Road Switcher built from 1956 to 1963 although in the last few years it was sold as an upgraded RS-36 unit (40 units). The RS-11 was built with the upgraded 251 engine which was more reliable than the old 244, but the damage had been done and Alco exited the RR market in 1969. Again it started up in mainline service and ended up as hump or yard engines. The NKP was a major purchaser of both the RS-11 and RS-36, their engineers preferred the RS-11 units as they could outpull and outstop their EMD competion although they were rougher riders. Rick
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