BS EN 17069-1:2019 pdf free.Railway applications – Systems and procedures for change of track gauge.
The design of the earthing system shall comply with EN 50153.The requirements regarding electrical resistance as set out in EN 13260 shall be applied. If necessary, specific electrical installation can be mounted. Vehicles fitted with variable- gauge systems shall fulfil EN 15273-1 and EN 15273-2.  The functionality of the system shall be defined at the design stage, together with its main features (e.g. how forces are received and transferred) in order to set an appropriate assessment methodology.Vehicles fitted with variable-gauge running gear should be capable of being operated with no restrictions due to the special features of their running gear. Vehicles equipped with variable-gauge running gear shall be able to negotiate curves with a radius of 150 m when coupled into a train. Individual wagons shall be able to negotiate curves with a radius of 75 m. Wagons intended to be operated between the 1 435 mm and 1 520 mm track gauge systems shall be able to negotiate curves with a radius of 60 m either when empty or loaded. In order to identify the variable-gauge running gear, rules for marking, as set out in EN 15877-1, shall be applied to all types of vehicles and nominal track gauges. NOTE The referred standard was originally intended for wagons only.For the design of the variable-gauge system, the following points shall be considered: 一 suitable combinations shall be chosen in order to avoid frictional corrosion on sliding surfaces between axle body and wheel hub. Protection against corrosion and dirt of the locking system and bearing surfaces for axial movement of wheels shall be taken into account; 一vehicles shall be designed to be lifted without dismounting their running gear; it should be possible to fit and remove wheelsets with the equipment for lifting and exchange that is normally used for standard wheelsets; reprofiling of wheels should not require any equipment other than that for standard wheelsets; 一checks on wheelset geometry shall be possible and integrity should be possible by using existing equipment for measuring and testing.BS EN 17069-1 pdf download.