As others have noted, the bigger bottleneck on the Northeast Corridor is the tracks themselves (or more precisely, a small number of problematic old railroad br

As others have noted, the bigger bottleneck on the Northeast Corridor is the tracks themselves (or more precisely, a small number of problematic old railroad bridges and tunnels). Amtrak has been moving to replace them under the Gateway project[1], but it's a significant undertaking given how critical the existing lines are. [1]: https://amtraknewera.com/gateway/ https://amtraknewera.com/gateway/