A New Switch and Crossing Design: Introducing the Back to Back Bistable Switch

Jou Yi Shih, Ramakrishnan Ambur, Hitesh Boghani, Roger Dixon, Edward Stewart

Research output: Contribution to journalArticlepeer-review


A new track swtich and crossing (S&C), the back to back bistable (B2B) switch, is proposed that has shown potential to significantly reduce the wheel/rail contact forces through the switch due to its more continuous wheel/rail contact interface and more uniform track stiffness arising from the elimination of the crossing nose. This offers a major reduction on maintenance cost of future S&Cs. The paper explains the concept and identifies the design guidelines for a current layout and uses vehicle/turnout dynamic modelling to predict wheel rail forces through a switch to identify performance improvements relative to a conventional S&C. Both multi-body simulation (MBS) and Finite Element (FE) model have been developed to account for dynamic and thermal analysis. The new design has shown improvements in lateral and vertical wheel-rail contact forces and less relative rail displacements due to thermal effect compared to the conventional S&C.
Original languageEnglish
Pages (from-to)175-186
Number of pages11
JournalJournal of Civil Engineering and Construction
Issue number4
Publication statusPublished - 15 Nov 2020


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