Another official shot if of the engine being lowered in, one thing to note is the engines were turned 180 degrees to the BR & NIR units 

A series of photos of what is probably crew training and familiarisation training 

Probably taken at the BR&CW works in Smethwick, the top two are of a 5 car unit with the second on heavily touched up for reproduction purposes and the lower two are a 3 car unit .​ 

Egyptian Thumpers

Official Builders pictures