Extraordinary video has emerged of a quadrocopter crashing into the Sydney Harbour Bridge last month.

The drone was launched by British man Edward Prescott. When the vehicle collided with a bridge girder and landed on the train line, it sparked an investigation by police and air safety authorities.

An edited version of the video uploaded to YouTube by Mr Prescott shows that the drone's camera was rolling the entire time it flew through and then into the Harbour Bridge, landed on a railway line, was picked up by Sydney Trains crew, placed in the train and taken back to their office.

The reaction and comments of the rail staff are all recorded.