- Very High Potential
- Northeast Corridor--Boston-New York-Washington--along with branches to Springfield and Harrisburg
- New York-Albany-Buffalo-Toledo-Chicago, with spurs to Boston, Toronto, and Detroit
- Routes radiating out of Chicago to Detroit, Indianapolis, and Milwaukee
- Routes in Florida connecting Tampa, Orlando, and Miami
- Route segments along the West Coast connecting San Diego-Los Angeles-Santa Barbara, San Jose-Oakland-Sacramento, and Portland-Seattle
- Routes connecting Ft. Worth, Dallas, San Antonio, and Houston--the "Texas Triangle--although the Dallas-Houston side of the triangle does not currently have passenger train service
- High Potential
- The "Inland Corridor" between New York-Springfield-Boston
- A southern extension of the Northeast Corridor between Washington-Richmond-Newport News
- Philadelphia-Pittsburgh
- Routes radiating out of Chicago to Pittsburgh, Cincinnati, Memphis, Kansas City, Omaha, and Minneapolis/St. Paul
- St. Louis-Kansas City
- Oakland-Fresno-Bakersfield
- Moderate Potential
- Springfield-Montreal
- Albany-Montreal
- Washington-Cincinnati
- Washington-Pittsburgh
- Washington-Richmond-the Carolinas-Florida
- Washington-Atlanta-Birmingham-New Orleans
- Omaha-Denver-Salt Lake City
- Minneapolis/St. Paul-Duluth Superior
- Salt Lake City-Boise-Portland
- St. Louis-Little Rock-Dallas-Ft. Worth
- New Orleans-Houston and Tucson-Los Angeles portions of the Sunset Route
- Los Angeles-Las Vegas
- Sacramento-Reno
- Sacramento-Portland
- Spokane-Seattle
- Spokane-Portland
- Memphis-New Orleans
- Low Potential
- Chicago-Quincy
- Kansas City-Albuquerque-Los Angeles
- San Jose-Santa Barbara
- Minneapolis/St. Paul-Grand Forks-Spokane
- Tucson-El Paso-San Antonio
- Salt Lake City-Las Vegas
- Ogden-Reno
from: Planned Growth for Profitability - Tactics
See also Figure 7, Market Potential of Network Additions.