All,
Accurail is coming out with a 36 foot fowler howe truss boxcar with one of the first cars decorated for the Monon:
http://accurail.com/accurail/ART/1100/1165_sm.jpgThis model shows a straight center sill and for some reason they haven't used the fish-belly center sill that they already have for their 36 ft double sheathed cars. This is pretty close for a stand-in model. Nice to have.
Regards,
Mike Aufderheide