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This document: — establishes the design process for switches and crossings (S&C), and the use of the other parts of this standard; — specifies the geometric design principles for wheel guidance; — establishes the basic limits of supply; — establishes the applied forces and their adequate support; — specifies tolerance levels. These are illustrated herein by application to a turnout. The main switch and crossing components are represented in turnouts and the principles used in turnouts apply equally to more complex layouts.