Ind. Code § 8-3-2-2

Sec. 2. All carriers subject to the provisions of this chapter are required to provide and to maintain in serviceable condition the number of suitable and substantial freight cars necessary to promptly supply the demands on their respective lines in this state for the prompt and expeditious shipment of all freight in carload lots. All such carriers are also required to provide and maintain in serviceable condition the number of suitable and substantial locomotives and other appliances and facilities necessary to promptly and expeditiously transport from point of origin to destination in this state all freight in carload lots which shall originate on their respective lines in this state and be tendered for transportation.