Hi everyone I going to make a new route called Suburban London What it about is and extension of DTG WCML South This will replace old dlc of South London Network and Later North London Line and Midland Mainline So what will the DLC add Mid Kent Lines from Lewisham to Hayes Kent South Eastern and Chatham Mainline to Orpington Bromley North Line East London line to Whitechapel North Kent Line and Dartford Loop Waterloo to Feltham Kingston Loop Line Southwestern Mainline Waterloo to Hampton Court Sutton & Mole Valley lines Chessington branch line South London line Thameslink Brighton Main Line to Purley Tattenham Corner line Caterham line and new trains more photos will be add later
You might be waiting a while for that. A rough estimate of the time taken to make the OPs suggestion is somewhere in the region of 20-25 years at eight hour days, five days a week. That is if they are an experienced route builder.