Perhaps there is scope for more of the national collection to be entrusted to preserved lines with perhaps the core collection (Scotsman/Truro etc) being housed at York? To my mind there is even a case for a dedicated NRM anexe purely covering diesels & electrics?
Some good points there Bob, but I wonder if you're being a bit much of an 'enthusiast'? There's nothing wrong in that of course, but it's not the purpose of any of our national museums. Their primary reason is, always has been, and (in my mind) should continue to be education.
In the context of educating, informing and entertaining (sorry for nicking the old BBC mantra, but it seems apt) the NRM has to tell the fantastic story of our railways. It has to look beyond the locos, rolling stock, models, etc and establish the context for the items in the national collection on the basis of where they fit in that story. I know they've made some spectacular howlers in the past (10000, 10001, 87 101, etc.) and perhaps even today in the fantastic ineptitude around Flying Scotsman.
I actually agree quite strongly in the need to make the national collection more accessible; get it out there into the care of individuals and displayed on as many sites as possible. But it can't jeopardise the ability to tell a sensible story at the main museum. And breaking the diesels and electrics out into a separate annex, even on the same site, would put a major (and largely artificial) break in that story.
As a free-form thought; surely the value for us as enthusiasts is actually primarily in the records kept by the museums, rather than the more obvious artefacts (the locos)? In which case we should be lobbying for the retention of MSIM as well as the NRM; the collection there is priceless and has a much greater value in Manchester than it would in York, Shildon or London.
Steph, in a slightly expansive mood.