Section 215.123 - Defective couplersA railroad may not place or continue in service a car, if-
(a) The car is equipped with a coupler shank that is bent out of alignment to the extent that the coupler will not couple automatically with the adjacent car;(b) The car has a coupler that has a crack in the highly stressed junction area of the shank and head as shown in the figure below (see figure 2).(c) The car has a coupler knuckle that is broken or cracked on the inside pulling face of the knuckle.(d) The car has a knuckle pin or knuckle thrower that is:(f) The car has a coupler with any of the following conditions:(1) The locklift is inoperative;(2) The coupler assembly does not have anticreep protection to prevent unintentional unlocking of the coupler lock; or