Interesting puzzle game that only comes up to full speed

At Train Yard it comes to direct trains from the departure station to the destination station by routing respective rails. In the first level it is all about, to make themselves familiar with the game by bringing the train from A to B. Over time, additional take-off and / or Zielbahnhfe happen so that more trains. Then come various colors that have in the corresponding color train stations. Later, you have to combine two or more trains to cross or leave trains to change their colors.

The game is in the first 10 - 15 rather low levels, because the levels are too easy. Then, the degree of difficulty - and with it the game - but clearly.

The required permissions are not necessary in my opinion, but still okay. The memory requirement is manageable. The game is completely in English, which some language knowledge presupposes, so that one also understands the tutorial. The graphics are quite simple (see screenshots), but functional, and the game can be played only in portrait mode. The control is implemented sensibly.

All in all an interesting and very tricky later in puzzle game that should have played as a puzzle fan.