It may seem strange that the Rail Head Treatment Train runs through the East Anglian Fens, an area notable for the virtual total absence of trees. However, once past Thetford, the line passes through several areas of forests, and here at Eccles Heath the cause of the problem can be appreciated. Although the silver birches in the background have lost their leaves, the oaks were still showing some autumn colour on 27 November 2006, when a filthy 20307 passed with the 1Z63 13:35 Wymondham to Colchester RHTT running 75 minutes early. 20312 is on the rear. This line is rich in steam age infrastructure, including semaphore signalling, and as seen here still used telegraph poles.