This paper describes an analytical study on the effects of secondary airspring deflation on the ride quality of a bogie vehicle. The vertical vibration characteristics, containing body-bending modes, are investigated for the situation where the body is excited by running over vertical track irregularities. The vibrations caused by the track irregularity are evaluated with the value of the ride quality level, LT, calculated from the vehicle body acceleration, for conditions with the airsprings normal or deflated. In the evaluation, the running speed is varied and a suitable speed reduction is calculated for the train operating with the airsprings deflated.
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