Centerbeam flatcars are generally used to carry cut lumber and building products. The TTX Co. supplies most centerbeams required by CSX customers for loading. Large numbers of centerbeams on CSX are owned by the western and Canadian railroads. The Centerbeam flatcar contains a center spine that makes it ideal for carrying lumber and building products.

Centerbeam flatcars carry lumber, wallboard and other dimensional products. Cut southern yellow pine and wallboard are the largest commodities shipped by CSX customers on centerbeams.

The 73' centerbeam flatcars are 73' interior length, most with a carrying capacity of 195,000 lbs. or greater. There are also 61' centerbeams available. All new centerbeam cars built have a capacity of 195,000 lbs. or greater.