All the players are given the name of a train station and stand in a cricle. Then one player is picked, they are blindfolded and led to the middle and spun around. The blindfolded player then calls out two stations names, these two must then swap places, moving inside the circle without being caught. If one of them is caught, they swap with the blindfolded player, otherwise the blindfolded player has to keep calling out names until they catch someone.
Source: From the original site.