Pennsylvania Railroad class T1 - Wikipedia
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 examples, were the last steam locomotives built for the PRR and arguably its most controversial. They were ambitious, technologically sophisticated, powerful, fast and distinctively ...
Duplex locomotive - Wikipedia
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.
Pennsylvania Railroad class S1 - Wikipedia
The PRR S1 class steam locomotive (nicknamed "The Big Engine") was a single experimental duplex locomotive of the Pennsylvania Railroad. It was designed to demonstrate the advantages of duplex drives espoused by Baldwin Chief Engineer Ralph P. Johnson.
PRR's Duplex Engines S1 (6-4-4-6) and T1 (4-4-4-4) - Blogger
Nov 17, 2020 · The first experimental duplex on the PRR was the S1, a huge rigid frame duplex locomotive of the 6-4-4-6 wheel arrangement. This engine was over 146' long! This locomotive was built by the PRR at Altoona in 1939; it was hailed as the largest locomotive ever built.
Pennsylvania Railroad 4-4-4-4 T1 Locomotive | Old ... - Old …
Jun 20, 2020 · The PRR T1 was a duplex locomotive that utilized a 4-4-4-4 wheel arrangement and was designed to haul 880 trailing tons (798-t) at 100 mph (161 km/h). PRR envisioned using the engines to haul express passenger trains on the 713-mile (1,147-km) route between Harrisburg, Pennsylvania and Chicago, Illinois.
Pennsylvania Railroad 6-4-4-6 S1 Locomotive | Old ... - Old …
Jul 5, 2018 · The PRR S1 was a unique duplex locomotive that utilized a 6-4-4-6 wheel arrangement. A six-wheel leading truck with 36 in (.91 m) wheels was positioned at the front of the engine. A set of four 84 in (2.13 m) drive wheels followed, trailed by …
4-4-4-4, 6-4-4-6, etc. "Duplex Drive" Locomotives in the USA
In 1939 the PRR built their first duplex-drive locomotive. The shrouding was designed by Raymond Loewy. During the first two summers of its existence (1939-40), 6100 was displayed under steam at the New York Worlds Fair. Its drivers were supported by rollers which allowed the drivers to turn (under steam) so that the fair goers could watch.
Presenting The PRR Q-1 Duplex 4-6-4-4 - 3rd Rail
The 1942-built Q1 was the PRR's first freight Duplex prototype. It was built with huge 77" drivers and streamlining. One of the handsomest streamlined engines built at that time.
Pennsylvania 4-4-4-4, 6-4-4-6, etc. "Duplex Drive ... - Steam …
The theory behind the duplex drive held that reducing the masses of reciprocating (e.g., main and side rods) and revolving (e.g., cranks and counterweights) would reduce hammering and raise speed. Tests run at a high boiler pressure and late cut-off …
Pennsylvania Railroad Class T1 | Locomotive Wiki | Fandom
The Pennsylvania Railroad 'Duplex-Drive' Class T1 were a class of 4-4-4-4 tender steam locomotives equipped with Duplex-Drive, they were a real attempt along with the K5 Pacifics to replace the aging K4 Pacifics. The first two T1's (6110 and 6111) were built by the Baldwin Locomotive Works in...