ge_rik
British narrow gauge (esp. Southwold and W&LLR)
About 18 months ago, I made a trip to the Etruria Bone and Flint MIll in Stoke to see their beam engine in action. Whilst there, I picked up a couple of books - one entitled "Stone and Steam in the Black Mountains" by David Tipper. It outlines the building of Grwyne Fawr Dam and Reservoir which included the construction of a three foot narrow gauge railway to serve the construction site. Interestingly, the railway was built along an existing roadway (a bit like the Darjeeling Himalayan Rly) and so had quite tortuous gradients (inc 1:9). Included in the book was a pencil drawing of one of their locos. I couldn't resist adding it to my list of possible scratch-bash 3D print builds.

Rik
Rik