I found instructions directly from ABB on how to modify their OOTB CAD model for the IRBT track.  The model is delivered by ABB as a 20m track, but can be easily adapted to suit any length.  This link shows how to do this in DELMIA V5.

http://www05.abb.com/global/scot/scot348.nsf/veritydisplay/9ae16756483e7cc1c1257aaa0054065c/\\\$file/GuideToModifyIRBT_DELMIA_V5_Track%20.pdf