It should also be borne in mind that many of the through lines have double, some triple, and some even quadruple tracks, which, if taken into the account, would increase the mileage much more; and still railroad construction in most of these States is far from being at a standstill. The United States will eventually be able to sustain a closer net of railways than any country in Europe, and we may rest assured that the time will come when the fertile prairie States of the Northwest will have a mile of railroad for every square mile of territory. In view of the future magnitude of the transportation interest the importance of placing its control and management early upon sound principles should not be under-estimated. Abuses crept into railroad management in the past, not because the men who controlled it were necessarily worse than men engaged in other pursuits, but because the States failed to provide adequate legislation for the control of this new social and commercial force, and the license enjoyed by railroad men gradually turned into serious evils what seemed at first only harmless practices. It cannot be denied, however, that the absence of restraint in time attracted to the business unscrupulous men whose sharp practices frequently forced their colleagues of better conscience to do what their sense of honor and justice condemned. These evils and abuses have increased with the growth of the railroad system, and nothing short of the sovereign power can now correct them. It is incumbent upon the state not only to correct the evils of the past, but to base legislative control of railroads upon principles so wise and so broad as to endure for ages, permitting the unlimited growth of the system and at the same time insuring commercial liberty and prosperity to the generations to come.