RETB

Radio Electronic Token Block is a token system used on the KaiserRail route. The system consists of stop boards and blue lights. The driver must abide them like they were level crossing white light. Stop on steady blue and go on flashing white. Those are used on single lines. Mostly crossings on RETB lines are AOCL, ABCL as they are easy to be maintained and doesn't tamper with the RETB. Only 1 AHB is on the line, it's near the signalling control centre. It had took long to be built, to readding wires so they do not tamper with RETB controls. The system is planned to be replaced in 2016 with ERTMS.