If you are wondering if it is actually possible to climb, stand, and even walk on a moving train like people do in the movies, yes it is.
That sport is called train surfing, or sometimes even known as train hopping and train hitchhiking. It is the act of riding on the outside of a moving train, tram, or some other form or rail transport.
While it is extremely dangerous, it is still practiced, especially on railroads where trains are overcrowded.
Train surfers have to practice balance, their core muscles, leg strength, and more. In India, train surfing is very popular, and a lot of people do it. Watch this short documentary to see how it looks, and what are the dangers of the sport.