Interesting that people can sell things they don't actually own. However, the same contributor of a version of the image has a photo of Padiham signal box with a similar bell bracket on Alamy so it looks likely that the box is on the Lancashire & Yorkshire. There are likely to be multiple copies of the image in collections as it was a large format 'lantern' slide which were commonly duplicated in sets to be publicly shown in the pre movie and TV days.This photo can be found on www.alamy.com under a heading which suggests that the signal box is of L&YR origin.