Here are some pics of what I mean I wasnt aware of the problem until I removed one of the center beams
First here is the car upside down after a replacement I havent put all the underside detail back on yet
This is a brand new center beam Those raised round things on both sides are what the trucks are mounted to
This is what was originally broken The little round thing was on the center round circle but broke off and detached the truck
This is whats left of two center beams that I took off Look at the castings You will see little hairline cracks in the pieces that arent apart already