Double headed 1S14

A Class 37, which seems to be 6703, and a Class 47 (1578 is a possibility from what I can make out).

 

The pre-TOPs numbers suggest early 1970s.

 

The location is Sunderland Bridge, a few miles south of Durham. As far as I can tell 1S14 was the 1300 Kings Cross-Edinburgh service.

Done