This article is about a type of locomotive. For the Austrian experimental 4-cylinder locomotive, see Locomotive Duplex.
Closeup of the second set of cylinders on the Pennsylvania Railroad class S1.
A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame; it is not an articulated locomotive. The concept was first used in France in 1863, but was particularly developed in the early 1930s by the Baldwin Locomotive Works, the largest commercial builder of steam locomotives in North America, under the supervision of its then chief engineer, Ralph P. Johnson.
Prior to this, the term duplex locomotive was sometimes applied to articulated locomotives in general.
A duplexlocomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive...
inferred from the context. The terms duplexlocomotive and Divided drive locomotive are used to describe locomotives with two drive wheel sets mounted in...
distinguish articulated and duplex arrangements; duplex arrangements would get a “-“ being rigid and articulated locomotives would get a “+” being flexible...
Google Duplex, an extension of Google Assistant Duplex (automobile), an early car built in Canada in 1923 Duplexlocomotive, a type of steam locomotive TGV...
The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental duplexlocomotive of the Pennsylvania Railroad. It was designed...
is a mainline duplex drive steam locomotive under construction in the United States. With an estimated completion by 2030, the locomotive will become the...
LocomotiveDuplex was an experimental 4-cylinder steam locomotive designed by John Haswell of the Austrian State Railway Works at Vienna and built in...
The Pennsylvania Railroad (PRR) class T1 duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 with two prototypes and later in 1945-1946 with 50...
production duplex steam locomotives of 4-4-6-4 wheel arrangement built between 1944 and 1945. They were the largest non-articulated locomotives ever built...
speed claims are tied to the Pennsylvania Railroad and their various duplexlocomotive classes. The S1 class during its lifetime was attributed to having...
Swiss Crocodile locomotive) but their use is now confined to shunter locomotives. On an articulated locomotive or a duplexlocomotive, driving wheels...
Duplexlocomotive Electric multiple unit Headboard (train) Headstock (rolling stock) Kryšpín's system List of locomotive builders List of locomotives...
steam locomotive from 1914 through the end of steam on the PRR in 1957. Attempts were made to replace the K4s, including the K5 and the T1 duplex locomotive...
Loewy, but,due to WWII, there was no publicity about it. The Q1 was a duplexlocomotive; it had a wheel arrangement of 4-6-4-4, consisting of a four-wheel...
with various aims in mind (the best-known more recent example is the Duplexlocomotive). In the case of Drummond, the main motive appears to have been to...
development of the locomotive had continued. It was designed using a duplex-drive which meant that it would be a duplexlocomotive and was designed to...
experimental duplex express passenger locomotive. S2 - experimental steam turbine locomotive. The duplex-drive T1 was the final class of steam locomotive constructed...
these experiments was the duplex #5600 George H. Emerson, the first of its kind. It was to be succeeded by a visionary locomotive of a unique design, of...
system not fitted, yet) PRR T1 4-4-4-4 duplex No. 5550: The Pennsylvania Railroad built 52 4-4-4-4 duplexlocomotives for passenger service, and the last...
Alco S-1, a locomotive PRR S1, a duplexlocomotive developed by the Pennsylvania Railroad LNER Class S1, a class of British steam locomotives NER Class...
wheels on a single locomotive is six, as seen on the 6-2-0 Crampton type and the Pennsylvania Railroad's 6-4-4-6 S1 duplexlocomotive and 6-8-6 S2 steam...
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