It is impossible to answer that, because your question is very inespecific.
Have you ever used abaqus?
What are you trying to modeling? The wheel-rail? The ground? The whole train?
And... what are you looking for? Fatigue? Vibrations? Static Stresses?
thanks for replying replying
i never used the program before .
i wanna model ballast deflection after a series of repeated sinsudial load
i used a pressure on a surface of the ballast about 500kpa but i dont know which proper setting to go with
thanks for replying tkks2040
i am using tabular amplitude
but i do not know how to use periodic amplitude.
i wanna simulate 10000 cycle and each cycle duration 0.02376 second
Please find more information regarding periodic amplitudes in the link to the section in Abaqus manual below. Kindly go through the various sections in the Abaqus manual.