Section 824.066 - Helper unit operation restrictions(1) Except for operation in its yards or terminals, no railroad shall permit or require a helper unit that is not attached to a train to be operated with a crew of fewer than two people.(2) As used in this section, "helper unit" means a locomotive power unit placed near the middle of or at the rear of a train to help the train traverse steep grades.(3) A violation of this section is a Class A violation. Formerly 761.331; 1999 c.1051 §231