HST is a railway preservation society which specialises in the preservation of diesel shunters and the initials "HST" can be seen as a pun on High Speed Train (shunters being very low-speed machines).
HST is a railway preservation society and is the only preservation society that solely specialises in the preservation of diesel shunters in the UK. The initials "HST" can be seen as a pun on High Speed Train (shunters being very low-speed machines).