Why Switzerland Has A Rail Replacement Helicopter | QI

Elf's Note: It's difficult to direct hot air balloons to specific points, and trains can carry more people at once. You can now watch every series of QI, including this one, on iPlayer! ▶ http://qi.com/iplayer Follow QI on Twitter ▶ http://twitter.com/qikipedia Follow QI on TikTok ▶ https://www.tiktok.com/@theqielves Follow QI on Facebook ▶ http://facebook.com/officialQI Follow QI on Instagram ▶ http://instagram.com/theqielves Subscribe on YouTube ▶ http://youtube.com/theqielves For more visit ▶ http://qi.com This clip is from QI Series V, Episode 7, 'Visionaries' with Sandi Toksvig, Alan Davies, Cally Beaton, Nish Kumar and Laura Smyth.