Why Can't Trains Go Uphill? | James May's Q&A | Earth Lab

James May looks at why trains can't go uphill! Subscribe: http://bit.ly/SubscribeToEarthLab Taken from James May's Q&A Ep 30 Best of Earth Lab: http://bit.ly/EarthLabOriginals Best of BBC Earth: http://bit.ly/TheBestOfBBCEarthVideos The Doctors Are In The House: http://bit.ly/TheDoctorsAreInTheHouse Welcome to BBC Earth Lab! Here we answer all your curious questions about science in the world around you (and further afield too). If there's a question you have that we haven't yet answered let us know in the comments on any of our videos and it could be answered by one of our Earth Lab experts. Want to share your views with the team? Join our fan panel: http://tinyurl.com/YouTube-BBCEarth-FanPanel This is a channel from BBC Worldwide, trading as BBC Studios, who help fund new BBC programmes.Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx