In principle, RUs and EIUs are expected to use vehicles only for their intended use, i.e. to use them for their intended purpose, taking into account their design characteristics, e.g. for the carriage of passengers or goods or for shunting operations. In this case, the RU or EIU is also registered in the National Vehicle Register as the responsible ECM for the vehicles. For train movements, the RU or EIU is always the responsible undertaking indicated in the header of the timetable. For shunting, the RU or EIU is also responsible and the driver and shunting staff are assigned to the safety management system of the responsible RU or EIU. Exceptions apply to vehicles that are only used to clear the route after an accident or for use in the context of technical assistance pursuant to § 4 (3) sentence 1 number 2 AEG.