At first this is very simple: Red train leaves from the station to the red red target. Blue train from the station to the blue blue target. According to placing the rails.
But this is really more difficult. Because soon there's several trains, different colored trains that then mix color and then the train no longer fits in perfectly to the goal. Or trains intersect or collide. Then you have to look like you laid the rails so that the trains do not crash.
"Train Yard" is so varied, clever game, in which there is a lot to think. One must not only consider how to transport connections and color-correct building the rails, they must also herumbauen around obstacles and hurdles and there are always more and always trickier routes. In addition, the rails can be laid well. "Train Yard" is not only a well thought Kniffelspiel, it can also be tactile play very well.