Historical clue formulations

• Line running roughly parallel to Interstate 95 — 2026-04-11
• High-speed travel option — 2026-02-22
• High-speed Amtrak train — 2025-12-22
• Transit option since 2000 — 2025-11-22
• East Coast Amtrak service — 2025-09-01
• What's on the fast track? — 2025-03-16
• Successor of the Metroliner — 2024-12-06
• East Coast travel option — 2024-07-06
• Train line between Boston and D.C. — 2024-06-11
• High-speed commuter option — 2024-02-09
• Fastest train in the U.S. — 2024-01-14
• 150-mile-per-hour train — 2024-01-07
• Speedy Amtrak service — 2023-06-20
• Train that stops in New Haven and New York — 2023-03-05
• East Coast Amtrak service with the fastest trains in the Americas — 2023-02-01
• Speedy travel option — 2022-05-01
• Amtrak express train — 2022-02-28
• Northeast Corridor train — 2022-02-17
• Express service since 2000 — 2022-02-03
• Amtrak service — 2021-11-07
• Train through eight states — 2021-07-16
• What's on the fast track? — 2021-05-15
• Train that serves three Union Stations — 2021-05-07
• ___ corridor, Northeast transportation route — 2020-12-30
• It travels from D.C. to Boston in about seven hours — 2020-06-27
• D.C.-to-Boston transport — 2020-06-21
• It stops at Union and Penn Stations — 2020-04-26
• Speedy Amtrak option — 2019-07-16
• Train from Boston to Washington — 2018-10-17
• ___ Express (Boston-to-Washington connection) — 2018-01-17
• Northeast Corridor express train — 2017-04-05
• Express starting in 2000 — 2017-01-07
• Northeast Corridor train — 2016-05-29
• Amtrak option — 2014-12-30
• Speedy Northeast conveyance — 2014-09-14
• Amtrak bullet train — 2014-04-02
• Amtrak high-speed train — 2013-05-14
• ___ Express — 2012-02-10
• Fast train to New York City — 2011-11-28
• Amtrak train — 2011-09-11
• Fleet Amtrak train — 2011-05-15
• Speedy Washington-to-Boston link — 2010-02-24
• Boston-to-Washington speedster — 2010-01-31
• Amtrak debut of 11/17/2000 — 2009-12-30
• Track speedster beginning in 2000 — 2009-10-17
• High-speed train from Boston to Washington — 2009-07-27
• Speedy express — 2008-03-15
• Amtrak speedster — 2007-02-07
• Amtrak service — 2006-09-17
• Amtrak train — 2005-12-04