How i imagine this wwent down:
Ford; “Just one more lane. It’ll work this time I swear.” Sane people: “No it wont and besides, We don’t have room for another lane” Ford: “But what if…”
Anyway. Let’s just build a damn train track. On land. One not owned by a freight service but dedicated to passenger transit.
Amd it’d still cost way less then a gaint tunnel in both building and maintenance.