Like with the GSP&P #13 the #5 is on a long-term loan to the Hillcrest & Wahtoke from the Glenwood, Southpark & Pacific. We get to use the locomotive in exchange for all maintenance costs and the GSP&P Gang has full access to run the locomotive anytime they want to.
While the #5 is similar in size to the #13, it's a much lighter locomotive and as such has less Tractive Effort / Drawbar Pull. We estimate it has about 80% the power of it's larger sister.