T.A. Yorke developed and sells a Gn15 interpretation of a loco tractor used over there. http://tomyorkegn15emporium.blogspot.de/2013/06/taiwan-mining-diesel-available-now.html
Does somebody in here knows, when and where the prototypes were built?
I am working on one of the Yorke kits at the moment

They are designed for a Black Beetle 38mm chassis, but I shortened mine, to take a 35 Hallig drive.
Have Fun
Juergen