Staff or Token
A vital safety device handed by the signalman to the driver or fireman of a train entering a single-track line. The staff, or token, carries a lock and the signalling equipment at the opposite end of the single track line cannot be operated without it. This ensures another train cannot enter the single track section in the opposite direction. The driver hands the staff or token to the signalman when he reaches the end of the single track section and collects the staff for the next section. The device is often carried on a large hoop to facilitate easy exchange and as one token is passed by signalman to driver the token for the previous section is exchanged from driver to signalman simultaneously .