The B1M put together some good content on the particular infrastructure problems that affect the route: https://www.theb1m.com/video/northeast-corridor-baltimor

The B1M put together some good content on the particular infrastructure problems that affect the route: https://www.theb1m.com/video/northeast-corridor-baltimore-tunnel https://www.theb1m.com/video/northeast-corridor-baltimore-tu... The route relies on some really old infrastructure, including single span bridges and tunnels that predate TBMs.