At the end of 2018, Rule Book modules TW5 and AC, RIS-3437-TOM, Defective On-Train Equipment, and its associated guidance (GOGN3637) for operation of trains following use of the emergency bypass switch, were updated. The resources at the bottom of this page are designed to help train operators update their contingency plans, and front line staff to understand the changes to arrangements for defective on-train equipment in the Rule Book modules. You can find full details of all the changes in the Impact Assessment that accompanies RIS-3437-TOM and TW5 in the RGS catalogue for September 2018.