Twenty-eight people were stranded on Le Monstre Monday. (CBC)Twenty-eight people trapped on a roller-coaster that stopped unexpectedly at Montreal's La Ronde amusement park Monday were finally rescued by firefighters after spending close to an hour perched on the famous wood attraction.

The roller-coaster was climbing a steep peak on the Monstre track around 2 p.m. when the train suddenly stopped midway up the hill.

A specialized squad of firefighters was called to the scene to assist the trapped thrill-seekers, who were mostly children.

They were helped off the roller-coaster with harnesses and cables during the rescue mission, which took about an hour.

No one was hurt.

Le Monstre is the world's tallest two-track, wooden roller-coaster, with lap bar-reinforced seats.

It's not the first time riders have been stuck on the roller coaster. In 1999, nearly 30 people spent half an hour stranded on Le Monstre when the train motor failed.

La Ronde opened for the summer season on Saturday.