With JT now onboard tsw, and another tube line being highly requested, how likely actually is it that we will see another tube line in the upcoming future?
The thing is that was also the first LU route for TSC. The other one being VDL. I don't see there being another one unless its backdated to early 2000's
Depends on the line. If I'm not wrong most lines use some form of ATO and another different signaling systems so that would need to be developed. Furthermore, most lines besides the Waterloo & city run across the entirety of Greater London and that means way more than 25 unique stations that need to be built. DTG said when talking about the 3 core routes of TSW 2 that BKL was the hardest to make even though it was that shortest. If any line was next in line i’d image it would be the Piccadilly.
If (big if, doesn't seem too likely to me) another LU line is coming, I feel like it could be the Circle - mostly because you can get quite a few lines for the price of one. You would get a fair chunk of the H&C and District lines, and seeing as it's all one train would reduce development time. If they wanted to do the Met too then they could do the S7+1 which makes it easier again. No new signaling needed if it's set a few years ago, but still with S stocks. Seems like a win win to me - more content, but less new work for whoever makes it. Speaking of, I don't think it would be Dovetail making it - seeing how they did Bakerloo makes me think they don't want to do it again. JT would make sense though, as they've done a few metro routes for TSC already.
Another Tube line could probably be the Piccadilly. It's full manual and look like the Bakerloo. +The Piccadilly have branches
TBF - It being not wanted dosen't mean it hasnt been suggested a lot. I see atleast one every 5 days for a LU route - Mostly Central or Piccadily. Its argueably highly suggested but a lot of people still don't want it.