I've just been looking at the sectional appendix for Scotland and found this...
Can't find much about what they are/were or do. Anyone know more?
Anti-Vandal (Q) trains are permitted to run over any line in Scotland even though limitations on traffic types may be
published elsewhere for certain lines. These trains must be signalled by the Train Identification Code 5Z97 and where
train describers are not in use, must be signalled by the special bell signal 4 - 3 - 1. Anti-Vandal trains are authorised to
stop in section as required, and on other than Track Circuit Block lines must be accepted in accordance with Block
Regulation 3, regulation 3.7 (Absolute Block) or Block Regulation 3.8 (Electric Token Block) as appropriate.
Can't find much about what they are/were or do. Anyone know more?