Indeed, according to Wikipedia it's supposed to be on the East Lancashire Railway but it's not there either, it's on the Jacobite Line (Fort William to Mallaig). I've been on it, and while Mallaig is no great shakes the Glenfinnan Viaduct is quite superb.
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BR Shed Codes were different back when they were private owners, they still kept them with BR Nationalisation but many changed as the region allocations changed. In 1973 BR opted for an Alphabetic System which was easier to use with the TOPS Loco's & Rolling stock management system..
For example Doncaster would have been '36A' but in '73 it would become just 'DN' [That's the Loco Shed not the Engineering Works] all works codes from '73 would start with the letter 'Z' ie Doncaster Works 'ZF', Crewe Works 'ZC' and so on..
My nearest TMD was Tinsley which was built in the mid 60's this was no ordinary TMD it had a giant specially built Marshalling Yard by the side of it.