(Source: Wired, January 23, 2017)
LONDON — The train’s air conditioning could fail in the summer heat. Snow could freeze the doors, trapping everyone inside (or out). Humidity could knock out the toilet’s flushing mechanism. Sleet could seep into the machinery and kill the train’s horn. Windows could magnify the sun’s rays, transforming the car into a greenhouse.
Full story: www.wired.com