This is something else and given time this will be one of the most sought after experiences for visitors.
We were met by a real lovely couple of ladies who explained everything about the history of the idea and prepared us for our fun train ride. It is a fascinating system which is very reassuring and soon you are off on your journey. With an interesting commentary you can relax whilst your travel at a decent speed to the turnaround.
I can imagine this idea spreading to a good many other redundant rail lines around the world. Soon to be famous.