Rolls-Royce Power the World of Rail Traction...
... for British Railways Pullman it's Rolls-Royce auxiliary diesel power. A February 1965 advert from Rolls-Royce showing their C8N horizontal engines fitted below a Blue Pullman set.
This advert appears in the following categories: Traction: Blue Pullman ; Supplier: Rolls-Royce ; Component: Diesel Engines (Power Unit)