How is the Neales ball token system or other physical token system worked?
This system is primarily used for single line routes (although it is seen on others too, e.g. MS-KMU-TPJ). The ball token system relies on the crew’s physical acquisition and carriage of a small metal ball to mark a train’s permission to enter a section of track. The ball is dispensed by a Token Instrument at either end of the block. The two instruments are interconnected so that at any given time, one and only one ball can be handed out from either of them, ensuring that only one train from either direction can enter the section of track (‘block’) controlled by them. The token is dispensed by the token instrument only when the block indication is set to Train Going To (see above) after Line Clear has been granted and Train Coming From has been set by the receiving station. While the ball token is carried by a particular train’s crew, no other train may enter that section of the track. The token instruments at either end of the block will not give out any tokens until the token carried
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