RM Bridge - Derailment loads BD37/01

Hi,

I am modeling a balanced cantilever rail bridge.

There is no macro or load type on Derailment load in the RM analyzer. I cannot find any writing or discussion regarding the Derailment Loads in RM bridge as well.

I know that I can create manually the pair of line loads for SLS and line load at parapet for overturning effect. How about the ULS where 4 point loads to be considered anywhere on the deck? (refer BD37/01 clause 8.5.2). I think it will be best if RM can generate this type of load using its influence line calculation and produce envelope results (.sup). But I don't know how.

Could anyone please share the correct way to assign derailment load onto RM bridge model following british standards.

Thank you.