I believe this was the tunnel heading into the grounds of Cyfartha Castle on the Pen-y-Darren Tramway. Unfortunately the two gents in the picture could not confirm this. Nice costumes, mind.
Location: Merthyr Tydfil
Original line: Pen-y-darren Tramway
Photographer: Ken Strachan
Contact photographer: Ken Strachan
Date: 30/06/2018
Image number: 65690