The major reason that government control or regulation of railroads and large production entities because of monopolies. In the late 19th and early 20th centuries there was major growth in industries such as the railroad and oil industries in the United States, at this time companies became monopolies in these industries and thus there was pressure on the U.S. Government to weaken the control of these monopolies.
Original jurisdiction gives certain lower level courts the right to hear a case first. Original jurisdiction means that a case is to be heard by a specific court and the case could later be reviewed by an appellate court.