An investigation has been launched after emergency services were called to the Tay Rail Bridge in error.
Firefighters and the Scottish Ambulance Service responded to a 999 call but rail staff didn't tell them the call was part of a training exercise.
Contractors were carrying out a training exercise to practice recovering a casualty from the bridge at around 10.30am on Wednesday.
A Network Rail spokesman said they apologised for the error and would investigate the break down in communications.
He added: "Ensuring staff are well prepared for managing incidents is an important aspect of any engineering project.
"Unfortunately, there was a breakdown in communications within the exercise which resulted in the emergency services being wrongly notified of an incident on the bridge. We apologise for the error and will investigate how it occurred and what we can do to ensure it does not happen again."