Sentencing for a man who tried to push his 14-year-old girlfriend in front of a train has been delayed following a last-minute change of heart by his young victim.

Lucas Gary Narkle, 19, faced the South Australian District Court on Thursday after earlier pleading guilty to endangering the life of his girlfriend in October, 2017.

He was due to be sentenced, but a prosecutor told the court the girl - who had previously refused to co-operate with the investigation - had decided to tender a victim impact statement.

Lucas Gary Narkle, 19, had his sentencing hearing pushed back. (9News)

Judge Simon Stretton agreed to a request to delay sentencing, and Narkle's bail was continued until a hearing next week.

The court on Wednesday heard the girl could be seen "holding on for dear life" as she was dragged along the station platform by Narkle.

Narkle was initially charged with attempted murder over the incident and spent more than three months in prison until he was granted bail by the Supreme Court in February.

Judge Stretton said that he was unlikely to impose further jail time on Narkle, but he was instead inclined to order that he perform community service work.

An Adelaide man tried to push his teenage girlfriend in front of a moving train. (9News)

"I have to bear in mind that his actual actions here are brief, irresponsible and didn't cause any physical harm at all," he said.

Narkle and his supporters sprinted from the court after Thursday's hearing.

They arrived more than 30 minutes late for Wednesday's hearing, blaming public transport issues for the delay.