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 , 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...
more... India. E.g., Radio Electronic Token Block working in the UK.)