3: Saxmundham. Alan Whitehouse continues his survey of the changing role signalman and signal-boxes. At Saxmundham on the East Suffolk Line the old heavy levers have been replaced with computers, monitors and a radio mast controlling 45 miles of track with 50 level crossings, all operated byjust one man. Does such technological investment in a line with just one train every two hours in each direction make economic sense? Producer Andy Cartwright