This is a BR Publicity photographs designed to be handed out and used for promotional purposes. The wording on the back says roughly PR&PO British Railways Please Acknowledge.
This photograph is particularly unique in that it shows Class 31 D5511 at Mallaig on 11th July 1958 when on trial in Scotland. See image 24644
Location: Mallaig
Original line: Mallaig Extension (West Highland Railway)
Photographer: PR&PO British Railways (Douglas Blades Collection)
Contact photographer: PR&PO British Railways (Douglas Blades Collection)
Date: 11/07/1958
Image number: 58702