Network Rail is training specialist engineers to deal with a surprising problem on our region's railways - swans on the line.
The birds mistake the railway for rivers in hot or wet weather, landing on the lines, injuring themselves.
Recent incidents in Surrey and Berkshire have led to lengthy delays.
Network Rail's emergency response teams are being trained to deal with the animal, in the hope a quick reaction will cut delays.
Engineers are sent to the Swan Sanctuary in Shepperton to learn how best to deal with the animals.