3Q07: Colas Rail Class 37 (37421) pushes the Ultrasonic Test Unit (UTU) through Axminster Station towards Salisbury, England. At this point on the West of England line, the train moves at a steady 30mph testing for minute flaws in the track. Light can be seen emitting from the second carriage in the consist. The DBSO unit at the front is 9703. Photo by Joe Rogers.