How is should steering knuckle vertical clearance be adjusted?

A) adding or subtracting shims
B) selecting the correct draw key
C) using the appropriate bushings
D) adjusting a stop bolt and jam nut

Knuckle Vertical Clearance

The vertical space required above a railway track to allow safe passage of trains without contacting any structures above, especially concerning knuckle couplers on rolling stock.

Draw Key

A type of key, often made of metal, used to secure components together by fitting into a corresponding slot or recess, commonly found in mechanical and engineering applications.

Jam Nut

A type of thin nut used to lock another nut by being tightened against it, mainly in situations where vibration might loosen the nuts.