$2.5bn/mile? Euh, sorry, I don't think it costs this much. "Get your shit together", the world will not wait. There is a reason why I go vacationing in SEA and not in Europe despite proximity.
[1] https://www.marketplace.org/2019/04/11/economy/subways-US-ex...
[2] https://pedestrianobservations.com/2019/03/03/why-american-c...