Mo. Rev. Stat. § 389.992: Division of motor carrier and railroad safety regulations.

The division of motor carrier and railroad safety shall make and enforce reasonable rules and regulations establishing minimum standards of track, bridge and roadbed inspection:

(1) For track, bridge and roadbed used by passenger trains or freight trains;

(2) For the qualifications of the inspector;

(3) For the frequency of inspection and territory to be covered;

(4) For method of inspection, including items requiring special attention;

(5) Action to be taken when defects are found.