I have looked again at the video for the footage of the industrial loco having trouble braking but that particular clip isnt on vol 78 although theres a clip of an Andrew Barcley loco Number 5 Nora shedding red hot coals over the undulating track ! There is about 4 minutes of footage of the Crumlin viaduct in service and its demise .
Also on this dvd is some good footage of NBL D6346 incharge of a pickup goods service shunting at Charlbury .
If you like industrial workings then this link may be of interest
WF