V2 4771 Green Arrow to return?

A fabricated block could be a way forward, like the P2. It would depend on whether the highest priority for Green Arrow was retaining its originality or becoming operational. It seems that both are not possible.

 

Indeed. My point, given the persistence of the view (myth?) that the monobloc is irreparable, is that the means of repair or replacement can't assume that a fabricated replacement would be acceptable.

 

Isn’t there a question of reversibility? That is, hypothetically you could remove the existing cylinder block and preserve it; and replace with a new set of cylinders (of any construction method, it wouldn’t matter visually); but doing so wouldn’t preclude a later reconstruction of the loco with its original cylinders, albeit for static display only. So a restoration with new cylinders doesn’t seem to me to preclude a future return to “original” condition if that was deemed important. (*)

(*) As an aside on that, if the monobloc cylinders are considered a significant engineering artefact in their own right, then they are probably better appreciated in any case as a standalone item, and possibly - speak it quietly! - sensitively sectioned.

Tom

 

It's a fair question, but that then also leads into questions of preservation ethics - questions that cannot be answered definitively, and are in reality matters of judgment rather than right/wrong

 

I agree however, at least until the 2019 policy is revised, it may be assumed NRM’d be open to considering the idea if there was a source of funding. Otherwise, logically, the policy would either not have mentioned GA as a candidate or could easily have said it’d be considered only if the existing cylinders were repairable.

 

I think casting techniques have moved on since the 1930's...