by mxhx This is a scalable design for a multi-station, where several trains can be processed on the same rail. Each station is activated independently acc. to its own condition (e.g. buffers low, enough items for a pickup, etc.). If several are active, the setup only lets one train route to the common rail (no thundering herds!), and makes other trains wait (no station skipping which breaks schedules). All 3 states (active, incoming, processing) are shown with a colored light (optional).