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An example of a shift: centre line shifts Constant shifts are supported. The shift remains the same, from its start chainage/station to its end chainage/station. a RR12_014 a) Constant shift An example of a shift: horizontal alignment with constant horizontal shift Horizontal shifts are always perpendicular to the centre line. a RR12_013 a) Horizontal alignment with constant shift; plan view Understanding the Terms and Expressions RoadRunner Rail 141