After the New haven was absorbed into the Penn Central at the end of 1968, there were 4 trains that terminated at Grand Central and 4 to Penn Station, the latter being trains that continued onto Philadelphia and Washington (the Colonial, Senator, Patriot, and Federal). I believe this continued up until Amtrak in 1971. There was also the Turbotrain, which I believe started out as a GCT run, but also switched to Penn, probably after A-day, which made more sense as it could then connect to a Metroliner. That is my recollection as I used these trains to travel from Boston to school near Philly. I generally tried to get the Penn runs as the transfer from GCT to Penn was as inconvenient then as it is now.
Jon
Courage is not the absence of fear; it is the determination that some things are more important than fear.