Trainyard is a simple puzzler that’s a bit like those hundreds of ooze-through-pipes games. You must lead a train (and in later levels, a bajillion trains) to its/their proper stations.
Unlike games like Pipe Dreams, however, you lay down all the tracks and then press go, with no race-against-the-clock gameplay. A slider on the bottom can speed up the cabooses, but if they crash--and they will--it’s back to the drawing board.
Switching tracks, boulders, and incoming trains keep Trainyard challenging. If you can finish the game you’ll be revered as an expert conductor.