If an electric train was going north at 100 miles/per hour which way would the smoke blow?

Why this works

This riddle plays on the assumption that all trains produce smoke, which is a classic characteristic of steam or diesel trains. However, electric trains are powered by electricity and therefore do not emit smoke at all. The clever twist here is that the question leads you to think about direction and speed, but the real trick is recognizing that there’s no smoke to blow in the first place!