The WCML capacity problem

The capacity shortage is south of Rugby. Going south, at Rugby there converge the two track route from Birmingham and the four tracks of the Trent Valley line which carry trains from Manchester, Liverpool and Glasgow. South of Rugby, the West Coast Main Line separates into two routes just two tracks. The fast route goes through Weedon and Kilsby, the slow lines through Northampton. They re-join at Roade and continue as four tracks to Primrose Hill, at the approach to Euston. South of Watford Junction there are, additionally, the two suburban line tracks. From Milton Keynes southwards there is, additionally commuter traffic as well as services which run south of London via Olympia.