Appendix J Safety assurance over fixed obtuse crossingsF1

(J.1)

The fixed obtuse crossings should be designed in order not to have a too long unguided length. In obtuse crossing check rails cannot be constructed to assure guidance over the whole length. This unguided length can be accepted up to a certain limit, defined by a reference situation defining:

(J.2)

(J.3)

(J.4)

The following graphs allow simple verification of unguided length for specific situation with different crossing angles, height of check rail and different crossing curvature.

(J.5)

Figure 8

Minimum wheel diameter against crossing angle for 450 m radius of obtuse crossing

Figure 9

Minimum wheel diameter against crossing angle for straight obtuse crossing