Railway transition curve steering with yaw actuated variable steering bogies

Curve transition steering has not been previously considered in idealised steering analysis and active steering bogies have been developed with considerations focused on the constant curving difficulties. A new bogie design, called an AY-VS bogie, is presented allowing yaw actuation of the bogie with variably controlled steering angles. This design is an advance on the previously published AY-FS bogie. Yaw angle and steering angle calculations have been performed for a linear transition are used to identify the steering angle correction required for AY-VS in a curve transition. The bogie is shown to provide improved stability performance over AY-FS. Curving improvements have also been achieved.