Fearless engineers take on one of the world's most dangerous jobs - repairing railway bridges as trains thunder along the tracks above.

The workmen use harnesses to hang from the side of the ageing structures while stripping the rust, tightening bolts and welding metal sheets.

They even keep their cool as locomotives full of passengers roar along the line just inches from their heads.

Footage shows the crew repairing bridges in Jawa Barat province on the archipelago's island of Java.

Saefulloh, one of the engineers, said: 'Our job is risky. It takes immense bravery, dedication, and a strong sense of duty.

'These professions often expose us to dangerous environments, life-threatening situations, and extreme physical or mental challenges.

'There are risks so we always put safety first. It's a job we can be proud of.'

Indonesia's railway system has undergone significant developments in recent years, focusing on high-speed rail and urban transit projects.

However, larges numbers of ageing lines like those in the video still run across the country.