The purpose of this leaflet is to give the user a means of estimating the effect of slipstream from passing trains on structures adjacent to the track, in various situations.
The formulae supplied enable calculation of the aerodynamic loads applied to the structure as a function of the speed of the train and its aerodynamic coefficient, and of the shape of the structure and its position relative to the track.
The leaflet considers vertical, horizontal and inclined structures and combinations thereof. Various example applications are given for common structures.
Various railways have observed fatigue-induced breakages in the metallic supports for noise protection walls; in response to this, an appendix details a fatigue calculation method for these structures (vertical walls).

Summary 1

1 - General 2

2 - Simple vertical surfaces parallel to tracks 3

3 - Simple horizontal surfaces above the tracks 6

4 - Simple horizontal surfaces close to tracks 8

5 - Mixed vertical and horizontal or inclined surfaces close to the tracks 10

6 - Closed surfaces enveloping the tracks over a limited length (15 to 20 m) 12

7 - Combined effect of slipstream and wind forces 13

8 - Application examples 14

Appendix A - Fatigue problems on noise barrier supports 23

Bibliography 33

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