 In 1988 the layout at Sizewell was extended so as to handle construction traffic for Sizewell B power station.Until October 2012, the section from Westerfield to Oulton Broad was signalled using Radio Electronic Token Block controlled from Saxmundham, and was the only line in England to use this system.However, due to radio frequency licensing issues, and the imminent beginning of an hourly train service on the line, which would have been beyond the capacity of RETB, Track Circuit Block signalling (using AzLM axle counters) has replaced the RETB system, after the last train on 19 October 2012.