Help with identifying old Katoomba Colliery Trucks

I am working on the History of ScenicWorld at Katoomba in the Blue Mountains, NSW, and I have these two photos of the two trucks operated by the Katoomba Colliery to deliver coal. They were taken between 1925 and 1935.
Can anyone help with identifying them please?
s159.photobucket.com/user/philipandpeta/...578656f.jpg.html?o=0
s159.photobucket.com/user/philipandpeta/...3c8ffa9.jpg.html?o=1

The top one has a USA look to it and the bottom British, the disc wheels are odd. (not a Thornycroft or Leyland).