you could ask someone at yuill and dodds up in hamilton.
they ran a lot of coal there at the time.
they must have pics of the scanias and volvos all kitted out with the saudi/aussie/usa spec windscreen grills and armour.
plod ■■■■■■ in and out,running in at daft times 24/7 ,all good fun.
oops,im thinking of the later miners one…( smacks self on back of legs) 