Historical clue formulations

• Bridge framework — 2026-04-02
• Bridge support — 2025-06-11
• Railroad bridge support — 2019-04-16
• Part of a bridge — 2019-01-16
• Bridge-supporting frame — 2018-10-28
• Sawhorse, e.g. — 2010-05-22
• River crosser — 2008-07-06
• Railroad support — 2006-01-31
• Certain bridge — 2003-12-21
• Engineering project — 2003-10-19
• Gorge crosser — 1999-12-26
• Track support — 1999-12-08
• River crosser, perhaps — 1998-06-28
• Engineering construction — 1997-06-07
• Valley crosser — 1997-05-11
• Bridge support — 1997-04-27
• Bridge support — 1996-05-28
• Planking support — 1996-05-10
• Bridge type — 1995-12-24
• Valley span — 1995-12-10
• Railroad bridge — 1995-07-05
• Bridge support — 1994-10-13
• Bridge support — 1993-11-27