Historical clue formulations

• Autobús alternative — 2017-11-25
• Mode of transportación — 2014-05-29
• Mexican transportación — 2013-10-20
• Autobús alternative — 2012-09-29
• Tampico track transport — 2010-04-30
• One way around Spain — 2009-11-14
• It's pulled by una locomotora — 2008-02-09