Railway Safety Act 2005
Attempting to obstruct, damage or derail a train, etc.
119.—A person who, without lawful authority, deliberately or maliciously—
( a) puts, places, casts or throws upon any railway property or across any railway track any wood, stone, vehicle or other matter or thing,
( b) takes up, removes or displaces any rail, sleeper, or other matter or thing belonging to a F135 [ railway organisation ], or
( c) turns, moves or diverts any points, signals or other plant or machinery belonging to a F135 [ railway organisation ],
to obstruct, damage or derail a train or to injure persons present on, using or working on railway property is guilty of an offence.