![]() ![]() The mechanical design work had been undertaken by Baldwin's chief engineer Ralph P. The two prototypes, #6110 and #6111, were constructed at the Baldwin Locomotive Works in April 1942. These locomotives were impressive performers but suffered from wheelslip and severe reliability problems, and did not last long in service. These had the cylinders in front of the wheels they drove, so that the rear pair were between the two sets of drivers. The next locomotives to use the 4-4-4-4 arrangement were the Pennsylvania Railroad's 52 class T1 locomotives (although the single class S1 was originally intended to be a 4-4-4-4, it was later changed to 6-4-4-6 due to increased weight). The Pennsylvania Railroad's controversial class T1 duplex locomotive. While it would be possible to make an articulated locomotive of this arrangement, the only 4-4-4-4s ever built were duplex locomotives-with two sets of cylinders driving two sets of driven wheels in one rigid frame, essentially a 4-8-4 with divided drive. ![]() Premature cylinder wear, cylinder clogging and restricted firebox sizeĪ 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. ![]() The Baltimore & Ohio Railroad's #5600 George H.
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