49 C.F.R. § 215.119 Defective freight car truck.
Title 49 - Transportation
A railroad may not place or continue in service a car, if the car has— (a) A side frame or bolster that— (1) Is broken; or (2) Has a crack of (b) A truck equipped with a snubbing device that is ineffective, as evidenced by— (1) A snubbing friction element that is worn beyond a wear indicator; (2) A snubber wear plate that is loose, missing (except by design), or worn through; (3) A broken or missing snubber activating spring; or (4) Snubber unit that is broken, or in the case of hydraulic units, is broken or leaking clearly formed droplets of oil or other fluid. (c) A side bearing in any of the following conditions: (1) Part of the side bearing assembly is missing or broken; (2) The bearings at one end of the car, on both sides, are in contact with the body bolster (except by design); (3) The bearings at one end of the car have a total clearance from the body bolster of more than (4) At diagonally opposite sides of the car, the bearings have a total clearance from the body bolsters of more than (d) Truck springs— (1) That do not maintain travel or load; (2) That are compressed solid; or (3) More than one outer spring of which is broken, or missing, in any spring cluster; (e) Interference between the truck bolster and the center plate that prevents proper truck rotations; or (f) Brake beam shelf support worn so excessively that it does not support the brake beam.
Title 49: Transportation
PART 215—RAILROAD FREIGHT CAR SAFETY STANDARDS
Subpart B—Freight Car Components
Suspension System
§ 215.119 Defective freight car truck.