Electronic Token Block, Radio Electronic Token Block (RETB), And Tokenless Block For Railway Signalling

The Evolution of Electronic Token Block for Railway SignallingThe origin of the electronic token block started in the late 1880s by Tyler & Co. with the development of the train tablet system. The main key operating principle of the electronic token block was having an instrument at each end of the section of the block electronically interlocked with each other and only one tablet could be withdrawn at a time and the tablet was given to th…