It certainly is similar to the LNER tourist green and cream livery, however it was slightly different in application on the mark 2s that were used on the Kyle line, and 5220 was formerly a Network Southeast vehicle.Ah, thanks! It's so faded and the other side is in fresh BR Blue, so I thought it was some variation on the sectorisation era Highland liveries.
It certainly is similar to the LNER tourist green and cream livery, however it was slightly different in application on the mark 2s that were used on the Kyle line, and 5220 was formerly a Network Southeast vehicle.
As I say though, this carriage was never employed on the Kyle line. It passed into preservation straight from Network Southeast.The red stripe is the key difference and may have been applied since use on the Kyle line.