Pennsylvania Railroad 5550 (PRR 5550) is a mainline duplex drive steam locomotive under construction in the United States. With an estimated completion by 2030, the locomotive will become the 53rd example of the Pennsylvania Railroad 's T1 steam locomotive class and the only operational locomotive of its type, [ 7 ] as well as the largest steam ...

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.

These components are what set the PRR T1 apart as a groundbreaking machine in steam propulsion history. The T1’s Rotary Cam Poppet Valves and Cylinders represent the pinnacle of innovation, marking it as a Duplex locomotive with two sets of cylinders on a rigid frame. Here’s where you come in.

2022年5月14日 · HARRISBURG, Pa. — In the first public showing of the combined cab, boiler shell, and prow of its new streamlined steam engine, No. 5550, the Pennsylvania Railroad T1 Steam Locomotive Trust displayed its progress on a project whose backers hope to see it …

T1 Trust正在制造T1型机车的第53台机车——T1-5550号机车，旨在于美国境内干线进行动态展示。 考虑到通货膨胀、人工成本、材料成本、制造成本、重新装配成本和设计成本，T1 Trust计划在17年的时间内耗费10000000美元，于2030年完成T1-5550号机车的制造。

2024年5月13日 · The Trust has designated its engine as PRR No. 5550, one above the highest-numbered production T1, No. 5549. The Trust has seven of the eight driver centers completed, and brought four to show what one side of the engine will look like when the parts are assembled.

2024年12月26日 · Starting in 2014, by casting a keystone-shaped number plate bearing the new locomotive’s identity — 5550 — it began fabricating the 51st T1 (not counting the prototypes). The group has conducted extensive research, including gathering almost a complete set of the original blueprints, in an effort to create an authentic rendition more than ...

2023年12月10日 · Actually, the T1 was better designed for its intended purpose than almost any of the contemporary high-speed express steam locomotives – particularly on a PRR with many name trains too large for a single K4. The design criteria were 880 tons at a sustained 100mph max – note that the T1 speedometers only read up to 100mph.

Pennsylvania No. 5550 is a 4-4-4-4 class T1 duplex locomotive currently under construction by the T1 Trust. The locomotive's completion date is currently estimated to be around 2030. The locomotive will be built to the early appearance of the production class, and will be fitted with Rotary-Cam Valve Gear.

The PRR T1 Trust is announcing the order of the first and second boiler course for new build 4-4-4-4 #5550. The order was placed with Continental Fabricators out of St. Louis, MO on January 26, 2018. This is a major milestone, as the boiler courses represent the largest parts yet built for the iconic streamlined duplex locomotive.