Whats a token system or a tokenless system?
A token block system uses a physical item (the token) of some sort, such as a ball as in the Neale’s Ball token system (see below), which is physically carried or manipulated in some way to indicate permission for a train to enter a block of track. A tokenless system, such as may be obtained by a combination of interlocking and semaphore signals, does not require the train crew to carry or manipulate anything tangible to enter or leave a block of track; they follow the signals and interlocking handles the rest. (There are also token systems where the ‘token’ is an electronic radio signal with a code on it that is transmitted to the loco; such systems are not in use in India.
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