What may cause low edges of the driving wheels?
Show the correct answer
Correct answer
A. The wheels falling off the trackway.
Explanation
In the photo you can see a tram bogie with its wheels standing on the rails. Low wheel flanges on the running wheels may cause the wheels to come off the track - answer A.
The flange is a raised ring on the inner side of the wheel, which runs in the groove of the rail and keeps the wheel on the track. When the flange is too low, for example worn down, the wheel climbs onto the rail more easily on a curve or at points and comes off the track, which means the tram derails. Slip (answer B) depends on grip, not on the flange, and the flange does not lock the wheelset (answer C).
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)
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