I often use the weather map on the USA Today to draw out a HSR network. I usually end up going overboard but hey, it is only imagination. I do hit a lot of states so it could and should get a lot of support. So, grab a USA Today and follow along (cities not listed on the map will be in parentheses):
1. NEC, naturally. Improved to higher speeds of course.
2. Chicago - (South Bend) - (Toledo) - Cleveland - Pittsburgh - Harrisburg - Philadelphia - and on to NYC as well as a branch from Pittsburgh to Washington DC
3. Chicago - Indianapolis (and a branch to Cincinnati) - Louisville (with a state funded branch to Frankfort and Lexington) - Nashville - (Chatanooga) - Atlanta - Macon - (Jessup) - Jacksonville
4. Chicago - Springfield - St. Louis - Memphis - Jackson - Baton Rouge - New Orleans (or Jackson - Hattiesburg - Gulfport/Biloxi - N.O.) with a split of the line at the Arkansas border that goes to Little Rock - Texarkana - Dallas-Ft Worth
5. Chicago to Detroit and with coordination with Canada on to Toronto - Montreal - Quebec City on another imaginary HSR line for our friends up north...
6. Boston - Concord - Montpelier - Burlington - Montreal
7. NYC - Albany - (Syracuse) - Rochester - Buffalo (and on to Toronto)
8. NYC - Albany - Burlington - Montreal
9. A state funded line for Tennessee of Memphis - [Nashville - Chatanooga] <- Nationally funded - Knoxville - (Bristol)
10. A continuation of the NEC down South: Washington DC - Richmond - Raleigh - Charlotte (I ignore the "Crescent Cities" in between, they get covered by the State and can meet up with the national system at Raleigh or Charlotte) - Greenville (state (NC) funded branch to Asheville) - Atlanta - Montgomery - Mobile - Gulfport/Biloxi - New Orleans. Also a branch from Raleigh - Fayetteville (with state funded line to Wilmington) - Myrtle Beach vicinity - Charleston - Hilton Head vicinity - Savannah - (Jessup) - Jacksonville
11. Atlanta - (Athens) - (Augusta) - Columbia - Charleston
12. Atlanta - Birmingham - Tupelo - Memphis - Little Rock -> DFW
13. Jacksonville - Daytona Beach - Orlando - West Palm Beach - Miami with a branch from Orlando to Tampa - Sarasota - Fort Myers
14. Jacksonville - Tallahassee - Pensacola - Mobile -> New Orleans - Baton Rouge -> Houston
15. Texas Triangle: DFW (situated near the airport in between the two cities, local rail can connect this to the two downtowns) - (Waco) - (Temple) - Austin - San Antonio, DFW - (Waco) - (Bryan-College Station) - Houston - (Galveston {maybe}), Houston - (Bryan-College Station) - Austin - San Antonio. I choose this route as it hits a massive college town and would connect two of the largest universities in the country together, worth in my eyes the slight extra length of this routing. Houston direct to San Antonio would not generate as many trips as adding the other two midpoints to the route, and it shortens the length of rail that would have to be built.
16. state funded branches from San Antonio to Corpus Christi - Brownsville, and S. A. to Laredo. LD train from New Orleans -> S. Antonio - Del Rio - Ft. Stockton - El Paso - Las Cruces - Tucson - Phoenix -> Los Angeles
17. Chicago -> St. Louis - (Columbia) or Jefferson City - Kansas City - (Lawrence) - Topeka - (Manhattan) - (West Kansas) - (Denver Int'l Airport) - Denver. Here I could go Chicago -> Omaha -> Denver but I think more ridership would be generated with the bigger cities of KC and StL included in the route.
18. DFW - (Sherman) - (Norman) - Oklahoma City (w/ branch to Tulsa) - Wichita - Topeka -> K.C.
19. DFW - (Wichita Falls) - Amarillo - Pueblo - Colorado Springs - Denver
20. Chicago - (O'hare airport) - Milwaukee - Madison - (La Crosse) - Minneapolis/St. Paul (plus Empire Builder to Seattle) with a branch from Milwaukee to Green Bay
21. Chicago - Davenport - (Iowa City) - Des Moines - Omaha - Lincoln
22. State funded: [Erie?] - Cleveland - (CLE airport) - Columbus - Dayton - Cincinnati - cincy airport - Louisville
23. Denver -> Pueblo - Santa Fe - Albuquerque - Phoenix (maybe via Gallup and Flagstaff) - Palm Springs - San Bernardino - Los Angeles
24. Los Angeles - San Bernardino - Las Vegas - St George - Cedar City - Salina - Salt Lake City
25. San Diego - LA - Bakersfield - Fresno - BRANCH to San Jose - San Francisco and Oakland, - Fresno - Sacramento - LD to Seattle or Vancouver, CA.
26. State funded line from Oakland/S.F. - Sacramento - Lake Tahoe - Carson City - Reno
27. A new LD that goes from (perhaps Denver) - Salt Lake City - Idaho Falls (Branch to Jackson Hole?) - Sun Valley - Boise - Burns - Bend - Portland -> Seattle
28. Eugene - Salem - Portland - Olympia - Seattle - Vancouver, CA.
29. To make Wyoming happy, a line from Denver to Cheyenne.
30. To make West Virginia happy - Wash DC to Chicago via WV and Cincy.
This hits every state save South Dakota and Alaska and Hawaii. This could have lots and lots of support in Congress. Too bad we don't have that $600 B, not that we'd need it all at once.
Apologies for the extreme length of this post. I finally decided to get this out there. I even left out some stuff. Remember, a network is more successful the greater number of nodes it has.