49 CFR § 215.117 - Defective roller bearing adapter.
A railroad may not place or continue in service a car, if the car has a roller bearing adapter that is -
(a) Cracked or broken;
(b) Not in its design position; or
(c) Worn on the crown of the adapter to the extent that the frame bears on the relief portion of the adapter, as shown in the figure below (see figure 1).