This European Standard specifies requirements for the design, testing and quality assurance of wheel slip prevention equipment. Each manufacturer is therefore responsible for taking every necessary step to make sure, that the quality of workmanship and construction is such as to ensure accordance with good engineering practice. This European Standard is applicable to wheel slip prevention systems for pneumatic braking systems without taking the type of vehicles and track-gauge into consideration. The principles of this standard also apply as a reference for other types of braking systems. The system is designed to control the sliding of wheels of railway vehicles to prevent wheel damage and to minimise the braking distance by optimising the available adhesion between wheel and rail.