6-4-4-6
1256995
196312864
2008-03-06T16:45:50Z
Jorge MG
3361164
[[Image:PRR S1.jpg|thumb|250px|The Pennsylvania Railroad's lone S1 was the only 6-4-4-6 ever constructed.]]
A '''6-4-4-6''' [[steam locomotive]], in the [[Whyte notation]] for describing [[locomotive]] [[wheel arrangement]]s, is one with six [[leading wheel]]s, two sets of four [[driving wheel]]s, and six [[trailing wheel]]s.
Other equivalent classifications are:<br />
[[UIC classification]]: '''3BB3''' (also known as [[German classification]] and [[Italian classification]])<br />
[[French classification]]: '''3223'''<br />
[[Turkish classification]]: '''2525'''<br />
[[Swiss classification]]: '''2/5+2/5'''<br />
The largest rigid frame passenger locomotive ever built, only one locomotive was produced to this arrangement, the [[Pennsylvania Railroad]]'s sole class [[PRR S1|S1]] of [[1939]]. It was a [[duplex locomotive]] and is often referred to as the ''Pennsylvania Type''. This experimental locomotive was exhibited at the [[1939 New York World's Fair]], and was afterward placed in limited service between [[Chicago, Illinois]] and [[Crestline, Ohio]]. The locomotive was too large to work elsewhere in the system. Pennsylvania Railroad executives hoped that the locomotive could haul 1,000 tons at 100 miles per hour, but this goal was not reached.
It was capable of very high speeds however, although no documentary evidence has so far surfaced to add credence to stories of record-breaking performance.
<br clear=all>
{{Whyte types}}
[[Category:Locomotives by wheel arrangement|6-06-4-6]]
[[cs:Lokomotiva S 1-6.100]]