This is the problem – when the block signals are missing we are unable to direct or precisely modify the flow of the traffic. I hope the implementation went wrong with something and the developers are already busy working on giving the players what they intended and hopefully this will fix these issues.
Old and modern signals are available. There are block and path signals. The right image shows three modern path signals and one block signal. As soon as a train crosses a block signal, all tracks behind the signal are blocked for other trains. Path signals work similar but block only the tracks behind the signal which are actually used by the train. This allows for realistic switch configurations e.g. in front of train stations.