31ª Semana de Tecnologia Metroferroviária

How to Simulate the Piston Effect in Train Tunnels

Why do you have to yawn or swallow to equalize the pressure in your ears when travelling through a tunnel? It’s all to do with a phenomena called the piston effect. What is the piston effect? When a train enters a tunnel, it compresses the air ahead of it, as the air it displaces is […]