Thanks Mad, ya beat me to it! Right after your post I Googled "Tallow Pot Oiler" and found all kinds of interesting stuff. Looks like you guys nailed it again! Really appreciate the help, Howard Dennis
Here's two I found interesting:
Tallow Pot Oiler
I think you guys are missing the boat about heavy oil use on the railroads. During the steam era heavy oil was used as a steam cylinder lubricant. Two types of oil cans were carried on the locomotive and kept sitting on the back of the hot boiler to keep the oil fluid. One can was the familiar long spout oiler often seen pictured with the engineeer. The other oiler was a squat type oil can with a curved spout called a "Tallow Pot". The fuel oils used by the railroads were signal oils and made use of a blend of kerosene and lard oil, different proportions used as the weather dictated. More kero in the winter and more lard oil during summer. This oil was used primarily in signal lanterns, ie. hand lanterns, switch lamps, markers, etc. Interior lighting was pure kerosene or on some rr's acetlyene gas.
If you want it nice and easy to pour, leave 'yer tallow pot on 'yer boiler or steam cylinder. By the time you have up steam, it's nice and runny!