EN 17069-1-2017 pdf download.Railway applications – Systems and procedures for change of track gauge – Part 1: Automatic Variable Gauge Systems.
5.2 Functional requirement
The design of the earthing system shall comply with EN 50153.
For any possible solution, requirements regarding electrical resistance as set out in EN 13260 shall be applied 2•
Vehicles fitted with variable-gauge systems shall fulfil EN 15273-1 and EN 15273-2.
6 Automatic Variable Gauge Systems
6.1 General
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.
6.2 Functional requirements
6.2.1 Running gear
Vehicles fitted with variable-gauge running gear should be capable of being operated with no restrictions due to the special features of their running gears.
Vehicles equipped with variable gauge running gear shall be able to negotiate curves with a radius of 150 m at a low speed 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 1435 mm and 1520 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 gears, rules for marking as set out in EN 15877-1 shall be applied to all type of vehicles and nominal track gauges3.
For the design of the variable-gauge system, the following recommendations should be considered:
— suitable combinations should be chosen in order to avoid frictional corrosion on sliding surfaces between axle body and wheel hub. It is also recommended that locking system and bearing surfaces for axial movement of wheels are protected against corrosion and dirt. This should be included in the design documentation;
— vehicles should be designed to be lifted without dismounting their running gears;
— it should be possible to fit and remove wheelsets with the equipment for lifting and exchange that is normally used for standard wheelsets;
• when design is out of the scope of EN 13103 or EN 13104. the calculation should follow the methods and load systems provided for in these standards. Requirements from EN 13261 shall be considered without chapter tolerances in this case.
— Non-rotating axles with freely rotating wheels:
• non-rotating axles with freely rotating wheels are not subject to rotating bending stresses. In addition, the number of cycles and the range of dynamic forces that non-rotating axles have to withstand are much lower. They shall therefore be considered as a part of the running gear frame to be calculated and approved according to EN 13749.
6.2.3 Wheel
Wheels shall comply with EN 13979-1 and EN 13262. When these standards do not apply due to the use of other type of technology, they should be considered at least as a guide. A validation process according to 6.3.1 shall be applied in any case.
It is allowed the use of any tread profile but dynamic behaviour shall always be In accordance with
EN 14363.
6.2.4 Axle boxes / Bearings
Axle boxes, greases and hearings shall comply with EN 12080, EN 12081 and EN 12082. When these standards are not to be directly applied due to the use of other type of technology, they should be considered at least as a guide. A validation process according to 6.3.1 shall be applied in any case.
It shall be possible to monitor the axle bearing condition either by:
— track side detection equipment; or
— on-board equipment.
Vehicles intended to be monitored by track side equipment on networks with 1435 mm nominal track gauge shall comply with all requirements regarding target zone and prohibitive zone as set out in
EN 15437-1.
For vehicles intended to be monitored by track side equipment on networks with nominal track gauges of 1520 mm, 1524 mm, 1600 mm or 1668 mm, the corresponding requirements for target zone and prohibitive zone are established in Annex A.
When hot-box detection is not possible at track-side, on-board systems according to EN 15437-2 shall be installed.EN 17069-1-2017 pdf download.