The more general point is that the only rail routes out of East Anglia are via London or via Ely.
Another, more direct route would be very useful.
To get to Birmingham, for example, is just not practical by rail. You can drive it in half the time, and by rail going via either route takes the same amount of time.
I call bull**** on the "drive it in half the time" claim.
It's 160 miles from Norwich to Birmingham - to drive Google Maps is reckoning just under 3 hours - so an average of about 50mph which given the roads in question is probably about right.
The train is just over 4 hours via London with some padding to allow the change to the tube and cross to Euston or 4h 20m via Ely with a 45 min wait at Ely for connection.
The fact is it's a longish distance over cross country roads or rail links - both of which have lower average speeds than motorways / main lines - and also serve the purpose of linking alot of other places en route.

