How Crossrail was affected by the curvature of the earth : v

Crossrail's tunnels under London are long, so long that when they were being planned, they were affected by something you might not expect -- the curvature of the earth.

Related Keywords

London , City Of , United Kingdom , Paddington , Westminster , British , , British National Grid , National Grid , Network Rail , Ordnance Survey National Grid , London Survey Grid , London Underground , Tottenham Court Road , Prime Meridian ,