This Picture was put on English Macks site by Pete 359 i think he might have some more of original P&S.
As far as i know they were all 6 Wheel Units,RHD and Diesel, most of there work was out of Parkhead Forge, when they finished up some Units went to Pentus Brown and the rest went to Austrailia,George Paterson went to Canada,this Picture has been taken in there Yard in Baillieston Glasgow in the 60s.
Ben.