Footprint of an Old Oak HS2 terminus
The Lords Economic Affairs Committee report on HS2 was highly critical of the entire scheme, but suggested that if did go ahead, it might be less silly to terminate the line at Old Oak, rather than Euston.
Needless to say, the cost and disruption savings would be enormous.
The HS2 Ltd design for Old Oak was for a through station, to Euston and HS1. A terminus of the same capacity as Euston HS2, would require more land, for perhaps 12 platforms. But how much more?
Clearly, nothing like as much as this:
For comparison, here is a drawing showing the footprint of the ‘through’ version of the station: