I'm not sure how light rail would solve the Castlefield issue or indeed have any impact on it at all, as the services which could most logically be Metrolinked (Atherton, Hadfield, Marple/Rose Hill) all go from the main trainshed or Victoria.
Yes. I find Burnham’s lack of interest in heavy rail incredibly frustrating.
Unfortunately Grayling’s takeaway message from his meetings with Burnham seemed to be that there were other options for Castlefield than the expensive ones, new more efficient stock, longer trains, 15&16, new signalling. Hence the endless reviews and no action.