Detail on a TBL-1+/ETCS-1 beacon. Although the name TBL-1+ suggests the system is based on or an update of TBL-1, it isn't related with TBL-1 at all. TBL-1+ actually uses the same beacons as ETCS-1 (Eurobalises), and supplements the existing Memor/Crocodile system in preventing signals passed at danger (SPAD) until all main corridors are equipped with the actual ETCS-1 system.