I can confirm from a daughter (now deceased) that he first got in to Railroading on the Colorado Midland as a shop helper and then as a mechinist. During WWI he moved to the Uintah because he could learn more and do more things than on the seniority system of the CM. He had an uncle, by the name of Richard Griffith that was an engineer on the Uintah. He flourished in the machine shop at Atchee and became master Mechanic by at least 1926.
I believe that he worked for the D&RG for a few years after the Uintah's demise in 1939, but in what regard I'm not sure, I was told a rumor that it was in Helper, Utah - but I can't confirm. He loved the lathe and made several interesting items on it, including a real cool brass canister with screw on lids at each end that he turned out himself.