Todd, funny you mention that you started this thread as below I have posted some images of some double-trucks that seem to have 2 or 1`oil cans with pipes that run down the running board on the fireman's side. I have wondered what these were for as they are not in Art Wallace's drawings but seem to be affixed to the engine with the piping and all. One "theory" of mine is that was some kind of flange oiler as the first few Masons had problems with pre-mature driver flange wear. Later locomotives from Mason had a more improved pilot truck that helped this problem. There is also a image of DSP&P 12 with a Baldwin at Deer Creek that show the same thing. Any other ideas?
DSP&P 3 1878-79
Two more images of DSP&P 8 1879-80