Historical clue formulations

• Airport transports, perhaps — 2024-11-30
• Theme park shuttles — 2023-06-06
• Trolleys — 2023-02-26
• Cable cars — 2019-11-20
• Some light rail options — 2018-06-20
• Transports between airport terminals — 2018-05-21
• Places for conductors — 2018-04-22
• J.F.K.'s AirTrain and others — 2016-02-10
• Some airport transports — 2015-06-24
• They may be used around veins — 2013-10-11
• Mine transports — 2007-02-05
• Some British lines — 2006-09-23
• Coal cars — 2005-09-18
• Colliery carriers — 2004-12-19
• Rock haulers — 2004-11-13
• Ore carriers — 2001-11-28
• Colliery carriers — 2000-09-16
• Streetcars — 2000-07-25
• Vehicles with bells — 1999-12-21
• They have their own lines — 1998-09-27
• Ore carriers — 1996-06-19
• Ways of London — 1996-04-17
• Mountain transports — 1994-08-13