Hi Daniel,
I'm thinkin' that you didn't have that huge orange "Diesel" in mind when you designed and built that wonderful layout!?!?
Not really, it is a very large two foot gauge South African diesel scratch built by the son of a friend of mine, it is very well made but a little out of place on what is supposed to be a small Welsh rural narrow gauge railway. Though the two foot gauge Welsh Highland Railway runs huge South African Garretts; I have a friend who drives one and the footplate is larger than some British standard gauge locomotives, they do look a bit like a bicycle from the front though. Along with the model there was some rolling stock which like the locomotive just managed the curves without taking out too many passengers on the station, but their couplings wouldn't manage the reverse curves.
Take care Tony.