There's a very interesting article on the conversion of one of Mt. Washinton Cog Railway's steam engines being converted to burn oil, biodiesel. Also they put in a Lempor exhaust ejector. It goes into quite a bit of technical detail with good photos and videos of the engine in operation.
Mt. Washington article
No doubt some may say blasphemy, seeing the billowing clouds of pure white steam, instead of coal black soot smoke, but it does look wonderful in the cold mountain air.