Euston Amalgam – a combination of Euston Express station for Euston and modifications to HS2’s approach tunnels.
Further discussions with the Department for Transport, HS2, Network Rail and others persuaded the Euston Express team to examine an alternative scheme which retained the E Ex scheme for Euston Station, with all tracks for WCML and HS2 within the station width, but connecting to the longer tunnel design of HS2 to avoid interfering with the WCML between Queens Park and Primrose Hill tunnels.
This is not only possible but also removes the need for the ‘Birdcage’ grade separation opposite Park Village East, and much reduces the effect of construction on WCML which, for the AP3 scheme, were severe.
This is described below as the ‘Euston Amalgam’, a combination of Euston Express station for Euston and modifications to HS2’s approach tunnels.
Cost estimates have changed, since the scope of both schemes has altered, but the like-for-like saving of the Euston Amalgam scheme compared with the latest version of AP3 is estimated to be £4.721bn.
See attachment…rh161130 Euston Amalgam summary Nov 2016 final