Snow1964
Established Member
Almost certainly technically possible, it is really a case of is there money for work to do the platform extensions, but more importantly the much bigger cost of the alterations at each terminus.So would it be possible to lengthen Northern platforms to allow 8 - 12 car running on the busiest routes?
In many cases the intermediate stations are relatively easy (especially as historically there was often space for goods sidings and loops, which are no longer there). Expensive station work are footbridges, lifts, canopies, accessible ramps, not adding a few metres of platform with modular parts.
However Northern has lots of platforms which are too low, and there tends to be a trend if doing platform work, then whole length is sorted so that adds to cost. (although shouldn't really lump in a cost of a historical difference fix in with optional cost of extensions). The UK railway has a habit of new work being expensively engineered even when tacked onto something of indifferent quality, rather than going for low cost upgrades