 Branching off HS1, it would briefly follow the WCML and GWML, branching off at the connection with the Central line, going to Northolt Junction, where it will follow the Chiltern Main Line and have a triangular junction serving a branch to Heathrow.The line will be tunnelled at Chiltern stations, up till Princes Risborough, where it will incorporate itself with the intercity line, up to Banbury, where it will branch off and hug the M40 and M42, before joining the Birmingham Loop, at Birmingham International/NEC.Links to Milton Keynes and Oxford via the Varsity Line, and Banbury in the middle of the Line, would experience a growth in services.