USRA light mountain driving wheels

Hi Guys, I'm awaiting the arrival of the Bachman N scale light mountain in the hope that it may act as an appropriate mech
for a NSWGR 57 class (down under, here in Australia). What is the driving wheel diameter for these locos and the driving wheel base?? I've done a quick google search for drawings and plans for these locos without success.
Cheers, Roger Gillard
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