C2C London Fenchurch Street / London Liverpool Street to Shoeburyness via Ockendon, basildon and the line Grays via Rainham. Add the class 377 and class 720.
This could be a great addition but C2c are unlikley to lincence it and it would take a while to complete
Not the 377, you mean the 387 but that was only a short-term loan before the 720s were introduced; they didn't coincide. And there's a much better, detailed, suggestion thread: https://forums.dovetailgames.com/threads/c2c-london-tilbury-and-southend-line.79395/ c2c returns to public ownership on 20 July, so that will become less of a problem.