It's those Western LD connections that are driving the Eastern connections. Amtrak could move the LSL and CL back a couple of hours and keep decent arrival times (actually, they could move the LSL all the way back to noon and arrive in NYP at 10 AM, assuming they kept the current timetable), but they would destroy connections (let alone "guaranteeable" connections) with a lot of Western trains that don't hit CHI until early afternoon. I've said it more than once, but Amtrak really needs a CHI-NEC train that can arrive before midday so folks don't have to write off a whole day with their travel plans.