IEC 62236-1:2008 outlines the structure and the content of the whole IEC 62236 series. The IEC 62236 series of standards provides both a framework for managing the EMC for railways and also specifies the limits for the electromagnetic (EM) emission of the railway as a whole to the outside world and for the EM emission and immunity for equipment operating within the railway. The main changes with respect to the previous edition are rewording of the introduction; and suppression of Annex B.