37670 & 37669 leave Saltford Tunnel at the head of 7C79 the 10.13 Parc Slip - Westbury Cement Works, the train engine had been replaced at Newport (East Usk) by the 37's, the working being used as a means to return the 2 37's to Margam where they were scheduled to be stored following their short but well documented re-incarnation. 10/4/06. ©Rail Photoprints