Someone at SOF wrote a beauty, which I kept and published here without attribution, while acknowledging it wasn't original to me. Probably via search engine, someone Named Ken Brown has stepped forward and claimed it is his. I have no reason to doubt it, though I don't have any ability to confirm it either. He has his own site, The View From Nunhead Station, which has as its current tope entry "Toward a New Railway History of Middle-Earth.
It is a thing little remembered – even by the Wise – that Dwarven miners had been laying or carving tracks along the floor of their tunnels to ease the movement of ore trucks and other gear since at least the end of the Second Age. Moria, in its time of glory, was completely spanned by such, and a cable-hauled gravity-assisted rack-and-pinion railway was laid in the to take mithril and gems down to Lorien, and return with such provisions as even Dwarves need.Sounds like my kinda guy.