A teenager has been captured on video violently vandalising and sticking his head out the window of a moving train in Sydney’s south.

Video shows the teen repeatedly kicking a door on the train as it travels between Hurstville and Kogarah.

The teen can be seen booting a steel section of the door out as another train travels past, all while photographing his reckless behaviour.

The boy then sticks his head outside the train window and laughs.

NSW Transport Minister Andrew Constance called the vandal’s behaviour “unacceptable” and “moronic”.

“This thoughtless, inept, rush of blood act could have killed someone,” Mr Constance said.

“It’s unacceptable, moronic behaviour”.

Sydney Trains revealed last year almost 300 sets of train doors were kicked in, causing commuter delays as a result of repairs.

The NSW government has installed $170 million worth of “kick-proof” Tangara doors in trains to combat the issue.