In multiplayer, tours are planned by human colleagues. The circulations in Omsi are not automatically 'properly' controlled and coordinated, because each developer uses different techniques and a clear system is not always recognizable.
The point is that using OMSI without BCS, I can follow a circulation properly and tours are properly displayed and this happens on every map, payware or freeware. Using BCS I cannot do that. So it's something within BCS and not on the map itself.