First off Jeff, nice summation. I'll add a little more. The SVRy 101 was purchased by SVRy May 8, 1937, AFE #441, for $13,865.05. I wonder what the 5 cents was for? Eng 101 replaced Eng 100 which was traded in, but is back at the SVRy today. SVRy recieved permission from the ICC to abandon the mainline 10-31-46. As Jeff said SVRy as a company, as a switching rr continued till Dec.31 '61. The mainline while somewhat unrelated to the history of the 101 continued in use till the last run of Eng 251 on June 12 1947. Salvage of the mainline continued into 1949 with the retirement of the flat cars used in the salvage effort 6-30-49. OLC 7 was last steamed up around 1954 or 55 if I remember correctly what Casey Carlson told me from an interview with the employee who had done so, but the 7 was kept on site till after 1961. OLC and SVRy which were owned by the 1950's, by the Lighthall family were sold to the Edward Hines Lbr. Co. in the mid 1950's. I don't have the date at my fingertips. While OLC properties were integrated into Ed. Hines, SVRy remained as a company owned by Ed. Hines. The last official run on the SVRy with 101 was Nov 28, 1961. The locomotive was still on site 12-4-63 per research of Mr John Lewis. Data recorded by Earl Emlaw who was purchasing agent at the time indicate it was sold to DRGW in 1963 so the date it left must have been in Dec. of 63, or shortly after.
Here is a bit of SVRy tivia that I bet few have run onto. SVRy purchased per AFE#633 Oct. 16 1950 a Std. ga. Alco 660 Hp diesel switcher #50. When I found this data I got real excited to see that there might have been a std. ga. engine used to replace the 101, but it appears that the engine may have never operated at Baker but was purchased for use on the Mt. Hood which was at that time still under common ownership with OLC and SVRy. Records show that it was leased to Mt. Hood. The following year, actually less than 3 monthes 1-1-51 AFE 636 it was sold to Mt. Hood. Pure speculation on my part, but I have read that SVRy operated in the black throughout it entire lifespan, but Mt Hood had longstanding indebtedness that was not cleared up till it's sale to the UP in 1968. It may simply have been easier to make the initial purchase by the solvent sister road that was credit worthy.