Discussion of products from the American Locomotive Company. A web site with current Alco 251 information can be found here: Fairbanks-Morse/Alco 251.
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As best I can determine, the GE 17MG governor was used on the Alco 12-244 and 16-244 engines, possibly the only governor type fitted to those types in railroad service. Then it was used on the early Alco 12-251 and 16-251 engines in railroad service, eventually displaced by the Woodward PG. But the 6-251 appears to have used the Woodward PG from the start. GE also used the 17MG on some of its Cooper Bessemer FVL-12T engine installations on export locomotives, although others had the Woodward UG8.