what set is this bridge from?

This bridge comes from a Steam Along Thomas set.

Quite right, to be precise from the Steam Along Thomas Special Anniversary Edition 4750, though of course it could have been in others as well. I've got one that's missing the bit that goes across the bottom between the two sides and supports the track without the need for a central pillar, so if anyone by any chance has one of those going spare, please let me know.

Excuse me, but does this accept a trading or selling policy?