Chinese loco on narrow gauge??? ack - scoff.
Boone, Iowa has one (standard gauge). They're not incredibly fond of it, although it does work. Ever use a set of Chinese tools and have busted knuckle syndrome? A whole other story is that the first one sank on the way to the states.
Superior Boiler of Los Angeles has built a new boiler for Roaring Camp's Heisler. They also reboilered some Disneyland locomotives. I believe that work was a lot less ($100k each) than the current quote for 318. Superior's current lead time for design and fab. of a boiler is around 9 months for smaller locomotives.
More info on Superior Boiler is available from email:
sbrca@aol.com.