I was waiting for a train and saw 2 GWR class 150 units coupled together, but one of which was in the older First Great Western livery. Firstly I was under the impression that 150's were used for branch lines only but this was on the mainline. GWR rebranded from FGW a few years back, so why was this unit still in the FGW livery? I have a picture. Does anyone know why they didn't change this unit?