49 C.F.R. § 215.121 Defective car body.
Title 49 - Transportation
A railroad may not place or continue in service a car, if: (a) Any portion of the car body, truck, or their appurtenances (except wheels) has less than a 2 (b) The car center sill is: (1) Broken; (2) Cracked more than 6 inches; or (3) Permanently bent or buckled more than 2 (c) The car has a coupler carrier that is: (1) Broken; (2) Missing; (3) Non-resilient and the coupler has a type F head. (d) After December 1, 1983, the car is a box car and its side doors are not equipped with operative hangers, or the equivalent, to prevent the doors from becoming disengaged. (e) The car has a center plate: (1) That is not properly secured; (2) Any portion of which is missing; or (3) That is broken; or (4) That has two or more cracks through its cross section (thickness) at the edge of the plate that extend to the portion of the plate that is obstructed from view while the truck is in place; or (f) The car has a broken sidesill, crossbearer, or body bolster. [44 FR 77340, Dec. 31, 1979, as amended at 47 FR 53737, Dec. 29, 1982]
Title 49: Transportation
PART 215—RAILROAD FREIGHT CAR SAFETY STANDARDS
Subpart B—Freight Car Components
Car Bodies
§ 215.121 Defective car body.