Some controversial opinions:
1: The Thameslink network needs a shake up, it’s too big, and it’s trying to do too many things at once, a oversized metro service or a interurban limited stop service, personally the latter is better for Thameslink, curtail the Sutton Loop and Catford lines to Blackfriars, bin off the Rainham service back to Southeastern, and restore the semi fast pattern again, and be the interurban express network it’s meant to be.
2: London Bridge isn’t the fancy interchange it’s made out to be, especially since the December 2022 timetable change, there should have been a Bridge or a intermediate mezzanine crossing or footbridge to siphon those seeking another train or those exiting the station or heading to the tube station.
3: The Elizabeth line can be unbearable, can hardly get any standing room at Woolwich most mornings, when it works it works well but the overcrowding issue is a pain,
4: However that said, I feel that the overcrowding of the Elizabeth line has a lot to do with people abandon the Woolwich and Bexleyheath lines like I’ve done as SE/DfT have gone out their way to make SE as unattractive as possible in “rationalising the network to one line one terminal” which in my view is pointless, especially as Charing Cross is the preferred destination.
5: The Gatwick and Heathrow expresses should be abolished, have Gatwick be a stop on a London-Clapham-Croydon-Gatwick-Brighton express service, in addition start pointing out London Bridge as the station which has the quickest service to the airport, and by getting rid of the Heathrow Express you’re freeing up paths on the GWML, you could have a fast Elizabeth line service to Heathrow to compensate, after Paddington it calls only at Ealing Broadway and Hayes & Harlington.