Train surfing (also known as train hopping or train hitching) is the act of hitching a ride on the outside of a moving train, tram or another rail transport. In a number of countries, the term train hopping is often confused with the term freight hopping, which means riding on the outside of a freight train, while train surfing can be practiced on any type of a train. This type of travelling can be dangerous and even life-threatening, because there is a risk of death or serious injury from falling off a moving train, electrocution from power supply (overhead lines, current collectors, resistors, etc.), colliding with a railway infrastructure (bridges, tunnels, platforms, traffic lights or other trains) while riding outside off structure gauge on the side or on the roof of a train, or unsuccessful attempts to jump on a moving train or off it. Today, the practice is forbidden by statutes on many railroads in the world. Despite this, it is still practiced, especially on those railroads where the trains are overcrowded.