| Pennsylvania Railroad 5550 |
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Artist's rendition of PRR 5550 when finished |
| Type and origin |
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| Power type | Steam |
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| Designer | Ralph P. Johnson
Raymond Loewy |
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| Builder | The T1 Trust |
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| Build date | 2014–Appx. 2030 |
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| Specifications |
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Configuration:
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| • Whyte | 4-4-4-4 |
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| • UIC | 2'BB2' |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) |
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| Leading dia. | 36 in (91 cm) |
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| Driver dia. | 80 in (203 cm) |
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| Trailing dia. | 42 in (107 cm) |
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| Wheelbase | 107 ft (33 m) |
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| • Engine | 51.92 ft (16 m) |
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| • Drivers | 25.33 ft (8 m) |
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| • Tender | 39 ft (12 m) |
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| Length | 122 ft 9+3⁄4 in (37 m) |
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| Width | 10 ft 0 in (3 m) |
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| Height | 15 ft 10 in (5 m) |
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| Frame type | Rigid |
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| Adhesive weight | 279,910 lb (126,965 kg) |
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| Loco weight | 502,200 lb (227,794 kg) |
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| Tender weight | 442,500 lb (200,715 kg) |
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| Total weight | 944,700 lb (428,509 kg) |
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| Tender type | Class 210-F-75A Tender |
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| Fuel type | oil |
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| Fuel capacity | 62,000 lb (28,123 kg) |
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| Water cap. | 21,000 US gal (79,494 L) |
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| Firebox: | |
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| • Grate area | 92 sq ft (9 m2) |
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Boiler:
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| • Diameter | 91+1⁄2 in (2 m) (front)
100 in (3 m) (back) |
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| • Tube plates | 214+13⁄16 in (5 m) |
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| Boiler pressure | 300 psi (2,068 kPa) |
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| Heating surface: | |
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| • Firebox | 490 sq ft (46 m2) |
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| • Total surface | 5,639 sq ft (523.9 m2) |
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Superheater:
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| • Heating area | 1,430 sq ft (133 m2) |
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| Cylinders | Four |
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| Cylinder size | 19.75 in × 26 in (502 mm × 660 mm) |
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| Valve gear | Franklin Type B2 rotary-cam |
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| Valve type | Poppet |
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| Performance figures |
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| Maximum speed | Approximately 110 mph (177 km/h) |
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| Career |
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| Operators | Pennsylvania Railroad T1 Steam Locomotive Trust |
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| Class | Pennsylvania Railroad T1 |
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| Number in class | 53 (52 built in the 20th Century, and 1 under construction) |
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| Numbers | PRR 5550 |
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| Disposition | Under construction |
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| Estimated completion by 2030 |
Pennsylvania Railroad 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, as well as the largest steam locomotive built in the United States since 1952. The estimated cost of PRR 5550 was originally $10 million, but an updated projected cost of $7 million was released with the acquisition of an existing long-haul tender from the Western New York Railway Historical Society in August 2017. Construction began in 2014 with the casting of the locomotive's keystone-shaped number plate. As of January 2025 the locomotive was over 52% complete.
