A study of the patent drawing in figure 7 reveals several interesting points. Note that the V's, and thus the point of bearing, are slightly in front of the center line of the truck axle. It was suggested in the patent specification that the V's might be placed to the front, rear, or directly over the axle, but in most actual applications they were placed directly over the axle. Note also that the locomotive shown on the figure is obviously a standard high-wheel American type which has suffered the rather awkward substitution of a pony truck for its regular 4-wheel arrangement. It is probable that few if any American types were so rebuilt.
Bissell was granted U.S. patent 21936 on November 2, 1858. British patent 2751 was issued for the same device on December 1, 1858. A few months later, in the summer of 1859, service tests of Bissell's new truck began in England.
First known use of the truck was on the British Eastern Counties Railway _No. 248_, a rigid-frame 2-4-0 built by Kitson in 1855. The leading wheels of the engine, as originally constructed, were attached to the frame in the same manner as the drivers and thus had no lateral freedom. For the test the front pedestals, which held the journal boxes of the leading wheels, were cut off and a Bissell pony truck was substituted. About a year later Alexander L. Holley reported on the success of the test.[19] The 248 had operated 17,500 miles, at speeds up to 50 m.p.h., safely and satisfactorily. The engine not only rode more steadily but showed a remarkable reduction in flange wear. The road was so pleased that by 1866 they had equipped 21 locomotives with Bissell trucks.[20] Several other British lines followed the example of the Eastern Counties Railway.
[Illustration: FIGURE 10.--The Hudson-Bissell truck permitted the introduction of Mogul and Consolidation type freight locomotives. This drawing shows a typical installation for a Consolidation of the 1880's. Item A is the equalizing lever which connects the truck to the springs of the front driving wheels. From figures 891-3 in J. G. A. Meyer, _Modern Locomotive Construction_, New York, John Wiley, 1904, p. 543.]
At first Bissell's 2-wheel truck received wider application in Europe than in this country, because most American roads, despite the interest in developing heavier freight locomotives, continued to depend upon the 4-4-0 as a dual-purpose machine. It was not until after 1870, when Mogul and Consolidation types appeared in greater numbers, that the 2-wheel truck became common in the United States.