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.
They can't see straight ahead or straight down...so it must look quite similar to a river for them."
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.
Any new starter, the first thing we do is...get them on a training course with the Swan Sanctuary to learn how to deal with these swans."