Mr. Stephens, the "Morning" 1030A from CUS was stronger than the "Afternoon" 230P simply on the strength that with three roads having their "Steel Fleets" arriving from the East in the 8-9A window (and they DID arrive), there was time to transfer from Central, Grand Central, LaSalle, and the South side of CUS and be on the "Morning". It is no surprise the Afternoon was first to be whacked.
But with no reliable morning arrivals anymore with the Lake Shore, Cap, City, and Card "showing up when they show up", the proposed extension of a 1030A Hiawatha would hardly be as strong, as Amtrak wisely would never guarantee that connection. All told, doubtful if such train would remove much through business from the Builder.
Finally, lest we not forget, the MILW was single tracked long about when the North Coast was whacked during '79 (I was still there).