There's the D600 - right on time!
A Lightalloys Limited advert from April 1959 for their ALPAX light alloy castings. The drawing shows a couple of trainspotters watching North British built D600 go by. These hydraulic made use of a cast ALPAX drivers cab and ALPAX castings for doors, windows, louvres and other components.
This advert appears in the following categories: Traction: Class 41 ; Supplier: Lightalloys Limited ; Component: Alloy Castings/Metals