Pennsylvania Railroad Class T1

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.
==History==
The first two T1's (6110 and 6111) were built by the Baldwin Locomotive Works in 1942; unlike later T1 designs (which were built at the PRR's own workshops in Altoona) they were slightly different. Their number keystone was on the bottom of the front and the tender was different. From 1945-1946, fifty more T1's (5500-5549) were built.https://www.steamlocomotive.com/locobase.php?country=USA&wheel=Duplex&railroad=prr#348https://prrt1steamlocomotivetrust.org/https://oldmachinepress.com/2020/06/20/pennsylvania-railroad-4-4-4-4-t1-locomotive/https://revivaler.com/pennsylvania-railroad-t1-t1a-duplex/https://web.archive.org/web/20200319033743/https://cf.cohs.org/repository/archives/web/cohm/cohm-2005-05.pdfhttp://www.jitterbuzz.com/stream.html#teeone
They were to be the next generation of steam passenger service. But like the Erie Triplex before and the S1 No. 6100 which was soon to perish, due to the troublesome nature with the drive gear, the T1 was susceptible to wheel slip, But they could reach the steam locomotive speed record easily. When the PRR purchased diesel engines, they were downgraded to mail and secondary express passenger service, they were retired in 1952 and scrapped in 1956. T1-6110's power output is 6,550 hp.
==Preservation==
The T1 class stopped operating by 1952, with some already being scrapped a year prior the rest being scrapped from said year to 1956 with none surviving.
===New Build===
In 2014, a non profit group called The Pennsylvania Railroad T1 Steam Locomotive Trust was formed by some preservation experts to build a new T1 and number it No.5550. The year 2015 was a major turning point for the company as they reached for their goal of $20,000. The new T1 is expected to be completed in 2030.
==List of Locomotives==
Class list of locomotives of the T1 class.
Image: 	No. 	Built:	Builder: 	Builder's No.	Status:
 	6110	1942 	Baldwin Locomotive Works	Unknown 	Prototype Scrapped, 1953.
 	6111	1942 	Baldwin Locomotive Works	Unknown 	Prototype Scrapped, 1953.
 	5500	1945 	Altoona Works 	4560 	Scrapped, 1953.
 	5501	1945 	Altoona Works 	4561 	Scrapped, 1953.
 	5502	1945 	Altoona Works 	4562 	Scrapped, 1953.
 	5503	1945 	Altoona Works 	4563 	Scrapped, 1953.
 	5504	1945 	Altoona Works 	4564 	Scrapped, 1953.
 	5505	1945 	Altoona Works 	4565 	Scrapped, 1953.
 	5506	1945 	Altoona Works 	4566 	Scrapped, 1953.
 	5507	1945 	Altoona Works 	4567 	Scrapped, 1953.
 	5508	1945 	Altoona Works 	4568 	Scrapped, 1952.
 	5509	1946 	Altoona Works 	4569 	Scrapped, 1953.
 	5510	1946 	Altoona Works 	4570 	Scrapped, 1953.
 	5511	1946 	Altoona Works 	4571 	Scrapped, 1953.
 	5512	1946 	Altoona Works 	4572 	Scrapped, 1953.
left 	5513	1946 	Altoona Works 	4573 	Scrapped, 1953.
 	5514	1946 	Altoona Works 	4574 	Scrapped, 1953.
 	5515	1946 	Altoona Works 	4575 	Scrapped, 1953.
 	5516	1946 	Altoona Works 	4576 	Scrapped, 1953.
 	5517	1946 	Altoona Works 	4577 	Scrapped, 1952.
 	5518	1946 	Altoona Works 	4578 	Scrapped, 1953.
 	5519	1946 	Altoona Works 	4579 	Scrapped, 1953.
 	5520	1946 	Altoona Works 	4580 	Scrapped, 1953.
 	5521	1946 	Altoona Works 	4581 	Scrapped, 1953.
 	5522	1946 	Altoona Works 	4582 	Scrapped, 1952.
 	5523	1946 	Altoona Works 	4583 	Scrapped, 1953.
 	5524	1946 	Altoona Works 	4584 	Scrapped, 1953.
 	5525	1945 	Baldwin Locomotive Works	72764 	Scrapped, 1953.
 	5526	1945 	Baldwin Locomotive Works	72765 	Scrapped, 1953.
 	5527	1945 	Baldwin Locomotive Works	72766 	Scrapped, 1953.
 	5528	1945 	Baldwin Locomotive Works	72767 	Scrapped, 1953.
 	5529	1945 	Baldwin Locomotive Works	72768 	Scrapped, 1953.
 	5530	1946 	Baldwin Locomotive Works	72769 	Withdrawn 1953; scrapped, 1956.
 	5531	1946 	Baldwin Locomotive Works	72770 	Withdrawn 1953; scrapped, 1956.
 	5532	1946 	Baldwin Locomotive Works	72771 	Withdrawn 1953; scrapped, 1956.
 	5533	1946 	Baldwin Locomotive Works	72772 	Withdrawn, 1953; scrapped, 1956.
 	5534	1946 	Baldwin Locomotive Works	72773 	Withdrawn, 1953; scrapped, 1956.
 	5535	1946 	Baldwin Locomotive Works	72774 	Withdrawn, 1953; scrapped, 1956.
 	5536	1946 	Baldwin Locomotive Works	72775 	Withdrawn, 1953; scrapped, 1956.
 	5537	1946 	Baldwin Locomotive Works	72776 	Withdrawn, 1953; scrapped, 1956.
 	5538	1946 	Baldwin Locomotive Works	72777 	Withdrawn, 1953; scrapped, 1956.
 	5539	1946 	Baldwin Locomotive Works	72778 	Withdrawn, 1953; scrapped, 1956.
 	5540	1946 	Baldwin Locomotive Works	72779 	Withdrawn, 1953; scrapped, 1956.
 	5541	1946 	Baldwin Locomotive Works	72780 	Withdrawn, 1953; scrapped, 1956.
 	5542	1946 	Baldwin Locomotive Works	72781 	Withdrawn, 1953; scrapped, 1956.
 	5543	1946 	Baldwin Locomotive Works	72782 	Withdrawn, 1953; scrapped, 1956.
 	5544	1946 	Baldwin Locomotive Works	72783 	Withdrawn, 1953; scrapped, 1956.
 	5545	1946 	Baldwin Locomotive Works	72784 	Withdrawn, 1953; scrapped, 1956.
 	5546	1946 	Baldwin Locomotive Works	72785 	Withdrawn, 1953; scrapped, 1956.
 	5547	1946 	Baldwin Locomotive Works	72786 	Withdrawn, 1953; scrapped, 1956.
 	5548	1946 	Baldwin Locomotive Works	72787 	Withdrawn, 1953; scrapped, 1956.
180x180px	5549	1946 	Baldwin Locomotive Works	72788 	Withdrawn, 1953; scrapped, 1956.
 	5550	2014 - Current
(Under Construction)	Solidworks 	None (Yet). 	Under construction.
==Trivia==
* A computer generated version of a PRR T1 is seen in the 2004 film Lemony Snicket's A Series of Unfortunate Events but has a Nathan P3 / a mix of a Leslie RS5T & a Nathan P5 horn instead of the Pennsylvania Railroad's 3 chime.
* The South Australian Railways 520 Class has a similar design to these shark-nosed giants; however, those engines are 4-8-4 Northern type engines meaning a T1 but it's drivers are not split into 2.
* The original T1's had a rounded bottom front with the number printed on it and the tender had the legend Pennsylvania painted in yellow and the PRR Keystone printed in a circle next to it. In the first few 5500 class engines, the tender was repainted to have the keystone painted above the lettering; on the last few engines built, the rounded front was flatter, The Keystone was made of brass and it was moved to the "nose" of the engine.
*T1 5547 was given Walschaerts valve gear as an experiment to lessen the tendency of wheelslip and wear on the valve gear. It was reclassified as T1a and became the only member of such.
*The first production example collided with a K4s in St. Louis, Missouri. It was rebuilt with Type B Rotary Cam Poppets, and was reported to have superior performance over the rest of the class.
*With the success of Type-B gear on 5500, an idea was entertained to fit the rest of the class with Type-B gear, although never acted on.
*Later T1 designs had access stairs built into the pilot as opposed to the ladder present on earlier T1s.
== Gallery==
File:Zvjeuguq8ki91.webp|PRR T1 Running Next to a New York Central Hudson
File:ASeriesofUnfortunateEventsPRRT1.jpeg|The CGI PRR T1 from the 2004 film "Lemony Snicket's A Series of Unfortunate Events".
File:Hqdefaultprrt1.jpeg
== Bibliography ==
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