On the main screen the configuration of the trackgroups can be opened with the icon 
.
Trackgroups only have an effect in automatoc operation. All tracks of a trackgroup can only be entered from one side. Therefore it is not possible that two trains enter a single line from both sides. But it is possible that two trains can follow each other on the same line.
Basis data
Name
Every trackgroup requires a unique name. If there is no name RailControl chooses a name for you and if the name is not unique it will be prefixed with a number to make it unique.
Tracks
The tracks that shall only be used in one direction can be selected here.
Signals
Obsolete. Is only shown if there are already signals configured. Will be removed in future versions.