(A prelude to a proper article about the Virtual Transition) Motto: Measured, weighed and divided. Principle of Virtual Transition The Principle of Virtual Transition is used in Permanent Way alignment design to establish when a transition curve in not needed and design a sudden change in curvature. The principle is defined in sheet B.3.4 of…
The track geometry is governed by numbers and all the time we are using them to design and check our work. The geometry of the non-linear transition curves is also governed by important numbers, useful to know in the alignment design when these transitions are used: – Bloss – Cosine (and its close approximation: the…
(a prelude to a proper design guidance) Non-linear transitions and their use in alignment design In alignment design the transition curves are used to provide a smooth variation of the centrifugal acceleration between alignment segments of different curvature. When needed, the cant transition is applied, in direct relation with the curvature variation of the transition…
A railway track blog 