Teenager's dangerous fun on the tracks...

A teen who ran into the path of an express train travelling at 90km/h, surviving by "millimetres", has been convicted by a court, reports adelaidenow.

Disturbing security camera footage, recorded at Mawson Lakes station and from inside the train, shows the teenager emerging from behind a stationary train into the path of a Gawler-bound express train.

The youth, 17, who was lucky to escape with only a broken ankle, was convicted in the Elizabeth Youth Court last week of stopping a train in motion without a reasonable excuse.