Md. Code, Public Utilities § 9–401

(a) Unless the Commission orders otherwise, a railroad company shall have sufficient cars and motive power to meet all requirements that reasonably may be anticipated to transport passengers, property, and freight.

(b) (1) If a railroad company does not have sufficient cars to meet the demand to transport freight in carload lots, the railroad company shall distribute available cars to shippers that apply.

(2) Except for giving priority to transporting livestock or perishable property, a railroad company may not discriminate in any way, including preferences as to shippers, localities, or competitive or noncompetitive points, when supplying cars under this section.