I have seen this route many times on PC its the line I use to go to work. I think its a great use of TFL rail lines and high speed commuter trains Such as the Class 90 and Class 321 plus the new trains turning up on the line. It's a long length of track but the London liverpool street to Norwich route could include the branch to Southend, Braintree and further. It might be a big job but when you look at the greater anglia line there's alot of high speed sections and some stunning views especially past Shenfield.
The small branch line to Sudbury (from Marks Tey) is very picturesque. The Chappel viaduct would be impressive. It’s a short branch line however.
