Historical clue formulations

• Travel option that serves 46 states — 2026-01-07
• The National Railroad Passenger Corporation, familiarly — 2024-08-27
• Operator of the Texas Eagle and Southwest Chief — 2023-12-17
• Operator of the Valley Flyer and Coast Starlight — 2022-06-26
• Service with a Capitol Corridor route — 2022-02-13
• Operator of the California Zephyr — 2021-06-16
• Metroliner operator, once — 2020-07-11
• Northeast Corridor service — 2016-02-22
• Pacific Surfliner operator — 2014-10-16
• Acela operator — 2011-06-07
• Acela Express operator — 2011-02-16
• Train company with a portmanteau name — 2008-08-06
• City of New Orleans operator — 2007-09-30
• Intercity passenger service created by Congress — 2006-07-04
• Metroliner company — 2004-05-12
• Acela Express runner — 2004-04-20
• Acela operator — 2002-10-16
• Vermonter operator — 2002-09-25
• Kind of station — 2001-12-15
• Acela Express offerer — 2001-03-23
• Greyhound alternative — 1999-08-10
• Kind of station — 1999-06-03