This European Standard is applicable to top devices of tank wagons used for liquid substances of RID carried in the liquid state and able to be top filled and emptied. Safety functions of these devices are subject to RID requirements and not described in this document. This European Standard specifies the type of equipment which is fitted on the top of such tank wagons and the important dimensions for their connections. This European Standard applies to new tank wagons built after the 1st January 2010.