Virtual Transition

This is an animation showing how a PWay Track Horizontal Alignment Virtual Transition is defined by the trajectory of the vehicle centre, when is passing over a railway track section with a sudden change in curvature:

Virtual Transition animation – the vehicle centre is describing a curve (red) as the vehicle is passing over the area of a sudden change in curvature for the horizontal alignment.

Virtual Transition animation – the vehicle centre is describing a curve (red) as the vehicle is passing over the area of a sudden change in curvature for the horizontal alignment.

The nature of this curve is presented in this post: THE VIRTUAL TRANSITION CURVATURE VARIATION.

More details about this principle and an alternative approach used in Europe for designing a sudden change in curvature is presented in my article “A different view on Virtual Transition. When is a transition curve not needed?”, published in the PWI Journal – October 2015:

PWI_Permanent_Way_Institution_The_Journal_133-4_Virtual_Transition_article_Pway_horizontal_alignment_constant_cant_railway_railroad_track_deficiency_rate_of_change_EN13803-2_RIL_800.0110

(click on the image to read the online version of the article on Academia.edu)

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