Non-Fatal Offences Against the Person Act 1997
14.— (1) A person shall be guilty of an offence who—
( a) intentionally places or throws any dangerous obstruction upon a railway, road, street, waterway or public place or interferes with any machinery, signal, equipment or other device for the direction, control or regulation of traffic thereon, or interferes with or throws anything at or on any conveyance used or to be used thereon, and
( b) is aware that injury to the person or damage to property may be caused thereby, or is reckless in that regard.
(2) In this section—
“ conveyance” means any conveyance constructed or adapted for the carriage of a person or persons or of goods by land or water;
“ railway” means a railway, a tramway, or a light railway or any part of a railway, tramway or light railway;
“ waterway” means any route upon water used by any conveyance.
(3) A person guilty of an offence under this section shall be liable—
( a) on summary conviction to a fine not exceeding £1,500 or to S.14 imprisonment for a term not exceeding 12 months or to both, or
( b) on conviction on indictment to a fine or to imprisonment for a term not exceeding 7 years or to both.