I haven't found much in the way of history for this grand old workhorse. I have found out that it was built by the Canadian Locomotive Company, Kingston, Ontario in 1930. It was originally numbered 144 while serving the Temiskaming & Northern Ontario Railway but was renumbered 503 upon becoming part of the Ontario Northland Railway.
It's a steam-driven, 2-8-0 type, meaning, two unpowered leading wheels on the front axle, 8 drive wheels on 4 axles, and no trailing wheels.
I wandered downtown to have a look around the train yard. As I was driving along, I caught a glimpse of something interesting. I doubled back to take a second look. This is what I found.