Who wants this? class 800 LNER azuma and the Thameslink class 700. They often share stations so they could be put into the same route. If the devs see this please consider it.
Ahh yes - either a almost 400 mile route or a 150ish route... tldr: no There will never be route connections likely - unlike tsc ue4 has such high graphics a massive route with constantly laoding vehicles wouldn't be good- the there's the issue of pricing/route - a giant route takes time - assuming there are no third party releases during the time dtg will slowly decrease there profits until the release when it rises again - the shorter more detailed routes are a win win: amazing detail for players and more money for dtg as there won't be much of a profit decrease. Remember: dtg don't care about us, there care about money - blame Adam Smith who created the fundamental concept of capitalism not me or dtg.
ECML operators (like LNER) run into Kings Cross last time I checked, well at least I hope so or I have been taking people to the wrong station for all this time!
Both are too long and for Peterborough, to Brighton, it's 129 miles 23ch. The way to break the 129 mi distance from Peterborough to Brighton is ECML South Peterborough to Kingscross 76 mi 29ch and BML extended to Kings Cross 54mi 42ch. The source is Railmiles Engine.