The rebuilding of LB had a great advantage in providing more Charing Cross route platforms & segregating Thameslink via the underpass a mile or so to the east. These benefited service reliability enormously.
The downside was the wonderful cross platform 10 second interchanges between Thameslink & Charing Cross services were destroyed, & also the walking time from train to Northern/Jub line were hugely increased for regulars who knew to be in the front of the London bound trains.
The LB emergency changes now suggested seem designed to make it harder for passengers to interchange, not easier.
The platforms are now wider than before so an interchange bridge is possible & needed with short escalators. And there should an interchange intermediate floor on the route to ground level from the platforms.
It will cost a lot. Maybe a tiny bit of the huge cost should be defrayed by freezing for ever more the pay of the rail bosses who signed off the very costly no expense spared LB scheme & ignored the inevitable interchange delays & the safety risks of the LB scheme.
Too many Network Rail ‘improvements’ are designed to minimise delay minutes, a good objective, but at the cost of total passenger travel time increased.
Viz longer interchange time, longer route from station platform to street or tube.
Midland main line platforms to tube platforms at St Pancras & the huge subterranean interchange route marches on the Liz line are prime examples. Compare with brilliant cross platform interchanges the Victoria line was designed with 60 years ago between the Vic & Northern, Piccadilly & Balerloo. These old railwaymen cared about making it easier for passengers & minimising total travel time.
Today’s rail boses want to make it harder.
I have seen Liz line supremos arguing that the Liz line interchanges with South Eastern at Abbey Wood were deliberately designed to avoid cross platform interchange & built with route marches over bridges to control passengers & have the potential to check interchange tickets.
TfL’s rebuild at Bank with the marathon walks involved & Kings Cross Northern Line platform exits a few years ago was signed off by people with the same mindsets.