This module acts as a passing track in a railway system. The module enables two trains to run on a single-track railway. Moreover, the two modules also enable three trains to run on a single-track railway.
The module consists of two switch-tracks and a stopper unit as shown in the following photograph.
The stopper unit has two yellow stoppers. The first train is stopped by the stopper. The stopper is invalidated by the incoming train, and the first train is then released. The operation of the passing track is achieved in this way.
This module has structured symmetry. Thus, the simple structure of the module makes it easier to build it.