Heat on overhead power lines has caused the cancellation of trains from London to other places. Questions have been asked as to why these same routes were similarly effected during the winter, but due to temperatures being too low.
It appears that train lines are subject to the same laws of physics that are behind life being possible on planet Earth.
In astronomy, the Goldilocks Zone is the distance from a star where an Earth-like planet can maintain liquid water on its surface and Earth-like life, as well as run a stable public transport infrastructure.
Anywhere between 5 degrees Celsius to around 25 degrees appear to be the optimum conditions for keeping trains running, although some reports suggest that this might be purely to keep sandwiches and cold drinks at the right temperature for first class passengers.