In the film "The Halfway House", shown on Talking Pictures TV yesterday, there's a shot of GWR Mogul 6364 pulling into "Ynysgwyn", the station for "Cwmbach" village (filmed at East Anstey according to IMDB).   6364 has the GWR roundel on the tender and is hauling 3 or 4 coaches, the first of which is solid coloured (all brown?) and also shows the GWR roundel.   There's some odd-looking apparatus fixed to the tender's nearside, just behind the loco cab. I have no idea what it is.   The film