Well whatever but I think the point remains that there is all sorts running about on it now that it would have have seen went it was part of the national network.
Your "arguements" get weaker by the second!
What on earth has running traction not used prior to closure got to do with anything?
It is a working railway, not a model railway. The LNER types simply do not exist, A8 tanks in particular. Even if they did, they wouldn't be "use nor ornament" for today's traffic requirements.
Preserved railways have to operate with what is available, economic and suitable for their traffic requirements. For the NYMR that means BR 4MT's, Black 5s and the absolutely perfect Southern S15 460. If you were going to purpose build a loco for the railway, you wouldn't go far wrong with that design. West Countrys, 9F's or whatever other type you care to mention pull trains, and delight the 90+% of the visitors, who couldn't tell one steam loco from another. All they care about, is that it isn't a diesel!
We are very lucky to have access to as many ex NER and LNER types as we do, plus the ex Lambton NCB 062t's, which as well as their NE heritage, are pretty similar to some ex NER types. Add in a decent rake of ex LNER coaches, and it's not looking too bad.
A vintage train would be lovely, but those pound notes don't grow on trees....