- 4-4-4-4
A 4-4-4-4
steam locomotive , in theWhyte notation for describinglocomotive wheel arrangement s, has a four-wheelleading truck , two sets of fourdriving wheel s, and a four-wheeltrailing truck .Other equivalent classifications are:
UIC classification : 2BB2 (also known asGerman classification andItalian classification )French classification : 2222Turkish classification : 2424Swiss classification : 2/4+2/4While it would be possible to make an
articulated locomotive of this arrangement, the only 4-4-4-4s ever built wereduplex locomotive s—with two sets of cylinders driving two sets of driven wheels in one rigid frame.The first locomotive built with this arrangement was the
Baltimore and Ohio Railroad 's sole class N-1 #5600 "George H. Emerson". To reduce the fixed wheelbase, this locomotive had the two sets of cylinders at opposite ends, so that the rear pair were beside the firebox. This proved to be a poor design, as it restricted the firebox size and exposed the cylinders to dust and dirt, causing premature wear. The locomotive was not considered successful enough to duplicate.Next were the
Pennsylvania Railroad 's 52 class T1 locomotives. These had the cylinders in front of the wheels they drove, so that the rear pair were between the two sets of drivers. These locomotives were impressive performers but suffered from wheelslip and severe reliability problems, and did not last long in service.External links
* [http://prrsteam.pennsyrr.com/prrt1.html Photos of PRR 4-4-4-4 locomotives]
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