Have a look at the BML2 website www.bml2.co.uk They have an interesting proposal to develop a second Brighton Main Line to relieve pressure on the current line.
Briefly, from Brighton, a tunnel under the Downs (branching off the Lewes line just after Falmer), then following the old Lewes - Uckfield line, then using the current Uckfield - E. Croydon line (including reinstating the lines to Tunbridge Wells West), via a much expanded E. Croydon station, then onwards to Canary Wharf.
A very exciting idea in my opinion. Would love to see it happen.
Briefly, from Brighton, a tunnel under the Downs (branching off the Lewes line just after Falmer), then following the old Lewes - Uckfield line, then using the current Uckfield - E. Croydon line (including reinstating the lines to Tunbridge Wells West), via a much expanded E. Croydon station, then onwards to Canary Wharf.
A very exciting idea in my opinion. Would love to see it happen.