Influence Surface (Railroad) [SPIG]

Live Load Setup

Rail: Rail object referencing the rail profile used for this influence surface.

Live Load Category [Gravity/Gravity and Centrifugal/Centrifugal/Hunting/Braking]: Influence-surface category used for this railroad live-load definition.

Unit Load Spacing Long.: Longitudinal spacing of the unit loads used to generate the influence surface.

Centrifugal factor comp. method [AREMA 1.3.6.c/User defined]: Method used to compute the centrifugal factor — AREMA 1.3.6.c formula or a user-defined value.

Max. Design Speed: Maximum design train speed used in centrifugal-force computation.

Centrifugal factor: User-defined centrifugal factor when method is 'User defined'.

Height of application point (from rail): Height above the rail at which the transverse force (hunting/centrifugal) is applied.

Hunting Force Factor (0-1): Fraction of the wheel load (0-1) applied as the hunting (lateral) force per AREMA 1.3.9.