I know what bunker oil is. We've had long discussions in this forum before about POL. I still believe that if other fuels were available (wood, combustible garbage, non-edible harvest waste for example) they would be used in a steam powered locomotive in preference to any kind of oil. Reason being that it wouldn't be hard to have a locomotive burning fuels other than oils. But it would be hard or impossible to do without oil for other purposes. See what I'm saying?
In any case there are cleverer people than me that made some great points about POL in previous threads. I highly recommend that all new members spend a few hours trawling through the thread map the sticky the second from the top of the main thread list. Kato has very kindly made it easy to find some of those excellent older threads on a variety of interesting topics.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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