Minn. Stat. § 219.559
Subd. 1. Caboose required.
Except as provided in subdivision 2, a railroad company may not operate a freight train 2,000 feet long or longer, if the train is handling placarded cars or is operated without block signals, unless the rear car is a caboose that is occupied by at least one member of the train crew.
Subd. 2. Exceptions.
(b) This section does not apply to:
Subd. 3. Shortwave radio.
No railroad company may operate a caboose unless it is equipped with an operable shortwave radio with the same frequency as the shortwave radio on the lead locomotive of the train.
Subd. 4. Penalty.
A railroad company violating this section is subject to a civil penalty of $350 for each offense. The operation of a train in violation of this section constitutes a separate violation for each day or part of a day it is so operated. The penalty must be recovered in a civil action by a railway employee, a railway labor organization as defined under the Railway Labor Act, or another interested person in a court having jurisdiction in a county in or through which the railroad line runs. The civil penalty is payable to the state. The court may issue an order requiring compliance with this section. The court shall award the prevailing party in the civil action attorney fees and costs.