its a Mk1 inspection vehicle. i dont think the end is origional. i suspect it was modified either in preservation or in departmental service. i dont know of a model in OO but there are enough Mk1 kits out there and it would be easy enough to make that end out of a piece of brass.
I think it was originally a Mk1 brake composite (BCK), the brake 1sts or 2nds would have a larger brake area. Bachmann may do this (with the original ends).
I visited the L&HR a few years back and I think this may be a conversion to provide a better environment for wheelchair users. They've also fitted extra steps to one side of each coach, as all their platforms are the same side. Many of the preserved railways seem to have hacked around Mk1s to make them more accessible.
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