Yes, that was Amtrak's "Network Growth Strategy" which was discussed in this report:
http://www.gao.gov/new.items/d02398.pdf" onclick="window.open(this.href);return false;
Some still are discussed. I still hold out hope (false?) about a Broadway. I feel there should be BOS-Florida service of some kind but they'd have to deal with Shore Line East (I think they should just extend one of the Virginia cars down to Florida or the SM to Boston). Also most if not all like the "Crescent Star" proposal. Finally you have the Sunset Limited reroute via Abilene. I know most of these are discussed in separate threads, not sure about the SL reroute (feel free to post a link).
Two pages from the summer 2000 timetable discussed possible implementations that never got off the ground. So Amtrak definitely planned to do them:
"Skyline Connection": Train from Chicago to Philadelphia (terminated in Philly, no direct service to NYP, schedule is listed) via Cleveland/Toledo:
http://timetables.org/full.php?group=20 ... &item=0030" onclick="window.open(this.href);return false;
Florida/Boston extension (no times/schedules listed):
http://timetables.org/full.php?group=20 ... &item=0034" onclick="window.open(this.href);return false;
At that point the Pennsylvanian ran PHL-CHI (not to/from NYP) as a day train leaving both ends really early in the morning and arriving at the other end really late at night. It was virtually worthless for endpoint traffic but decent for midpoint traffic (actually served Ohio outside of the graveyard shift for a change).
There might be others in that schedule as well different.