The tunnel is where a lot of delays happen, which ripple throughout the NEC, and beyond. The infrastructure is over a century old and maintenance is always kicked down the road. Things are finally being funded but there is A LOT of backlog to catch up on.

They are decades behind in maintenance and funding thanks to the previous republican administration. They used to have one of the best track records around. They are actually getting better, however now that they have funding again, a lot of their equipment is being overhauled and repaired since it was put off for so long, leaving fewer engines in rotation for when something goes wrong.