In my experience, 98% of Amtrak northbounds are on the east track. However, the one of the few times I've seen otherwise was the one day I took the train last year from DLB-NYP. All of on the east platform are watching as we see the locomotive crossover to the west platform just a few hundred yards ahead of the station. Gave me a scare to say the least.DLB is actually the Tri-Rail station and can be worked from either side since it does not handle checked baggage. The stations that handle checked baggage must be worked on the station side because there is no provision for the baggage carts to cross from one platform to the other.