mainline registered survivors

[westernpunk]

western champion was originally withdrawn in 1976, so its survived for 48 years.
Which got me thinking, what mainline registered loco or coaching stock even, has survived the longest , since being , first withdrawn

 

[30907]

Any mainline steam has had at least 56 years since withdrawal, and Flying Scotsman is probably the highest at 61.

 

[Harvester]

46100 Royal Scot is mainline certified. It was withdrawn in October 1962, three months before Flying Scotsman.