Union Pacific Class 5.

  Union Pacific 4-12-2 No. 9514, Class UP-5, was built by ALCO in 1930, one of eighty-eight locomotives. As built, she was numbered 9077, later re-numbered to 9514. These three-cylinder locomotives had the third cylinder located in the center of the steam chest. The third cylinder drove an eccentric in the axle of the second pair of drivers. The UP 9000s had two outside 27"x32" cylinders driving the third set of drive wheels and a third 27"x31" cylinder in the center driving the second axle. The 9000s had 67 inch drivers. They were constructed with "blind" driver tires on the third and fourth axles, that is, without the usual flanges, in an effort to promote easy passage through tight curves. The blind drivers were found to be unnecessary as tests of the first 4-12-2 proved the usefulness of the lateral motion devices fitted to the first and sixth driving axles.