Welsh Highland Railway
Today we had a trip from Caernarvon (where we are staying) to Portmadoc on the Welsh Highland Railway hauled both ways by this beast, a Beyer-Garrett built in Manchester in 1958 for South African Railways. Because of the gradients involved a powerful locomotive is needed and this fits the bill; it is effectively two locomotives in one, with powered wheels at both ends. This gives incredible power from just the one fire and boiler. Another solution to the problem was designed by the engineer Fairlie, and one of his designs runs on the Ffestiniogg railway from Portmadoc; I've added one as an extra.
Still no hotel wi-fi!