Keith
I have had a Lincoln AC225 for over forty years, and thought I should have one since I learned to weld in 8 grade metal shop! I have used it maybe 5 times but did use it last year and found out I had a hard time to keep from sticking the rods.
I am glad you have found another use for it. 225 amps verses 10 amps or so for most Lionel transformers is good upgrade an ought to keep the tracks clean.
Charlie