FWIW, the most recent study I&#x27;ve seen from Amtrak sets a target of about 4 hours from Boston to DC. (Which would be quite competitive with air.)<p><a href="https:&#x2F;&#x2F;www.amtrak.com&#x2F;ccurl&#x2F;214&#x2F;393&#x2F;A-Vision-for-High-Speed-Rail-in-the-Northeast-Corridor.pdf" rel="nofollow">https:&#x2F;&#x2F;www.amtrak.com&#x2F;ccurl&#x2F;214&#x2F;393&#x2F;A-Vision-for-High-Speed...</a>