I was there when the loop was under construction.
And if you do visit. Look not only at the engines and the scenery. This was a working gravity railway from the mines to the coast. Steam was to get the wagons back to the top and replace the horses.
“The route, whose final mile crossed the Cob, enabled loaded slate trains to run down by gravity while the horses that were used to haul the empty wagons back up the line could ride, feed and rest in ‘dandy’ wagons.”. c.f. 1832
Slate down. Horses pull up. Horse feed and rest on way down. Hard life in those days. Horses as well as men. Those lovely little steam engines put them all to pasture (or worse). Horses I mean!