Vandals could be behind Monday night's closure of the Gold Coast rail line.

Powerlines fell across the tracks, leaving 130 passengers stranded.

Buses replaced trains between Coomera and Varsity Lakes for nearly 24 hours.

Martin Ryan from Queensland Rail said police had been called into investigate.

"We did receive reports from a couple of ... customers thought social media that they had thought they had seen something in the rail corridor," he said.

"We have subsequently looked at some vision from some of the rail cameras that run through that area and we have identified there were a couple of people that were identified on a rail overhead bridge that we are investigating.

"We do unfortunately get regular reports of people within the rail corridor and yesterday afternoon there was a report of that from the public.

"We are investigating that with the police."