Leamside line Ferryhill -Pelaw. You could then extend the Metro to Washington which has been petitioned for in Parliament recently and diverts freights away from the Ferryhill -Newcastle section of the ECML.
Plus if the Leamside line is reinstated freight could continue to Stockton on the freight only line and head south through Yarm and rejoining the ECML at Northallerton where the ECML is 4 tracks, releasing paths between Newcastle & Northallerton.
That's one thing that puzzles me, why is Stockton to Ferryhill freight only. Surely it must be possible to send the odd XC or TPE service from Northallerton to Newcastle via Eaglescliffe/Stockton.
