Caption: GATX is gradually replacing the bolster bearings on its cars with new constant-contact bearings. The bearings on most cars are just blocks of steel, which do not make constant contact with the frame of the car, resulting in the car rocking from side to side. Constant-contact bearings have a core made of a rubber composite that compresses when the car is lowered onto its trucks, making constant contact. This reduces the car's tendency to sway.
