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.
In 1958, it was decided that a nuclear shelter to protect the seniors of the Canadian Government would be built. In addition, several other such shelters would be built around the country to aid in dealing with nuclear emergency and rebuilding. Construction of CFS Carp, the largest facility, began in 1959 in an abandoned gravel pit that was found to have an underground water spring.
Cobalt is a town founded on silver mining. In 1903, while constructing the railway, silver was discovered, and a town was born. 400 mines later, there isn't much happening in Cobalt today, but there's LOTS to explore.
Additional information available on Wikipedia.
Settlement here began as early as 1841, but it wasn’t until 1854 that the town, then known as Centerville, would be formally laid out. In 1865, the Post Office would open, changing the name to Centralia as it would be officially incorporated the following year.
Coal mining was the principal employer in the region until the 1960’s when many of the companies would begin going out of business.