It is 12-07 on a Friday and the pannier has just run round its train (the coach tail lamp is still attached) at platform 6, where is it off to? Does anyone have a WTT (or STT as the GWR and BR(W) used to term them), and can tell us?
Chris Foren says "I have the WTT for summer '61 which does not help much. At 12.07 pm a dmu should have just arrived from Blaenavon to return at 1.8 pm. Perhaps 3662 and its coaches were covering for a unit failure?"