Welcome to the forum, pullacross!
More support for the statement that wherever you go in the World, you'll find a Cornishman. I believe the reasoning behind this goes back to when tin-mining ceased in Cornwall, the miners had a skill that was so much in demand, they were welcomed anywhere in the World.
Look forward to seeing some photos of NZ railways which seem to be very 'American' in appearance.
http://en.wikipedia.org/wiki/Rail_tr...in_New_Zealand
Do you have anything on the Ferrymead Railway? I had an uncle who lived in Christchurch (sadly passed away a few years ago) - he was one of the volunteers helping to run the railway.