The American Transfer Company was soon working in harmony with the United Pipe Lines, of which Captain J. J. Vandergrift was the president. This system had its nucleus, like all the others of the country, in a short private line, built in 1869 by Captain Vandergrift. It had grown until in 1874 it handled thirty per cent. of the oil of the region. Now in 1872, after the Oil War, Captain Vandergrift had become a convert to Mr. Rockefeller’s theory of the “good of the oil business,” and as we have seen, had gone into the National Refiners’ Association as vice-president. Later he became a director in the Standard Oil Company. In 1874 he sold a one-third interest of his great pipe-line system to Standard men, and the line was reorganised in the interests of that company. That is, the Standard Oil Combination in 1876 was a large transporter of oil, for the directors and leading stockholders owned and operated fully forty per cent. of the pipe-lines of the Oil Regions, owned all but a very few of the tank cars on both the Central and Erie roads, and controlled under leases two great oil terminals, those of the Erie and Central roads. It was little wonder that Colonel Potts watched this rapid concentration of transportation and refining interests with dread. It was more dangerous than the single shipper, and he had always fought that idea on the ground of policy. “In the first place, it concentrates great power in the hands of one party over the trade of the road,” he told an investigating committee of Congress in 1888. “They can remove it at pleasure. In the second place I think a large number of parties engaged in the same trade are very apt to divide themselves into two different classes as to the way of viewing markets; one class will be hopeful, and the other the reverse. The result will be there will be always one or the other class engaged in shipping some of the traffic.... The whole question seems to me to resolve itself into determining what policy will bring the largest volume in the most regular way to the carrier; and it is my opinion, based upon such experience as I have had, that a hundred shippers of a carload a day would be sure to give to a carrier a more regular volume of business, and I think, probably, a larger total volume of business in a year’s time than one shipper of a hundred cars a day.”[53] Holding this theory, Colonel Potts had opposed the rebate to the Standard granted by the Pennsylvania in 1875. Three years later he described in a communication, published anonymously, the effect of the rebates granted at that time: