rail car loading

huangyhg

rail car loading
i have a slab on grade with a freight railroad running over it.  the rails are going to be attached to the slab.  i have no idea what types of load the rails will impart to the slab.  i'd like to make sure my slab doesn't crack to pieces.  the slab is for a loading platform, so i don't really need to worry about high speed trains running over it.
has anyone ever run into a situation like this?  are there any good online references (i don't feel like buying another book).  ideally what i'd like is a strip load that i can pop into a mat slab program or into some slab on grade charts.  i'm in an ibc 2003 location.  thanks.
you’d probably want to use a cooper e-80 loading.
here’s a few links:
i think you should get back to the owner and ask for extra info about the maximum loading and weights,,it's not a railway bridge to take the loads from the standards,it's like a crane load, get back to the manefacturer or the owner
+$100.00 for a new book seems like a very small investment to help assure a proper and safe design.  you might even learn something from the new book.
flyby911, the op did state "freight railroad" loading.  
that is much more significant that a crane.  the e-80 loading would be applicable...perhaps no impact factor though if the speed is slow.
jae , yes you'r right..
i think also he needs a design approach also for the slab on grade,
when i designed slab on grades i used to make shell elements in the sap2000 rested on springs in every joint with a stiffness equals to coeff of subgrade reaction of the soil multiplied by the area it's supporting
but in that case i would need in addition to check bearing stress of the strip load of one rail on the rc slab
thanks for the replies.  i think the e-80 loading is about what i was looking for.  i'm going to place the loading into a simple finite elements program for slabs on elastic supports.  
don't forget that the rails (and ties, if any) help distribute the e-80 wheel loads over a larger slab area.