Friday Night Steam

Two videos tonight on an unusual engine!

 From Wikipedia: http://en.wikipedia.org/wiki/PRR_T1

Pennsylvania Railroad T1

The Pennsylvania Railroad's 52 T1 class duplex-drive 4-4-4-4 steam locomotives, introduced in 1942 (2 prototypes) and 1945-1946 (50 production), were their last steam locomotives built and their most controversial. They were ambitious, technologically sophisticated, powerful, fast, and distinctively streamlined by Raymond Loewy. However, they were also prone to violent wheelslip both when starting and at speed, complicated to maintain, and expensive to run. The PRR vowed in 1948 to place diesel locomotives on all express passenger trains, leaving unanswered the question of whether the T1's flaws were solvable. An article in the Pennsylvania Railroad Technical and Historical Society Magazine published in 2008 revealed that the wheel-slip problems may have been caused by the failure to properly train engineers transitioning to the T1, resulting in excessive throttle applications, which in turn caused the driving wheels to slip. Another root cause of wheel slip was faulty spring equalization. The drivers were equalized together and not equalized with the engine truck. In the field, the PRR equalized the engine truck with the front engine and the trailing truck with the rear engine.Pennsylvania Railroad T1


Type and origin
Power type     Steam
Builder     Altoona Works (#5500–5524)
Baldwin Locomotive Works (#5525–5549, 6110–6111)
Serial number     Altoona 4560–4584
BLW 72764–72788 (#5525–5519)
Build date     1942 (#6110–6111)
1945–46 (#5500–5549)
Total produced     52
Specifications
Configuration     4-4-4-4
UIC classification     2′BB2′
Gauge     4 ft 8 1⁄2 in (1,435 mm)
Leading wheel
diameter     36 in (914 mm)
Driver diameter     80 in (2,032 mm)
Trailing wheel
diameter     42 in (1,067 mm)
Length     122 ft 9 3⁄4 in (37.43 m)
Width     11 ft 1 in (3.38 m)
Height     6111: 16 ft 6 in (5.03 m)[1]
Axle load     71,680 lb (32.5 tonnes)
Weight on drivers     279,910 lb (127.0 tonnes)
Locomotive weight     502,200 lb (227.8 tonnes)
Tender weight     Empty: 197,400 lb (89.5 tonnes);
Loaded: 442,500 lb (200.7 tonnes)
Tender type     180 P 84
Fuel type     Coal
Fuel capacity     85,200 lb (38.6 tonnes)
Water capacity     19,200 US gal (73,000 l; 16,000 imp gal)
Boiler pressure     300 lbf/in2 (2.07 MPa)
Heating surface:
– Firebox     490 sq ft (45.5 m2)
– Total     5,639 sq ft (523.9 m2)
Superheater area     1,430 sq ft (132.9 m2)
Cylinders     Four
Cylinder size     19.75 in × 26 in (502 mm × 660 mm)
Valve type     Poppet valves
Performance figures
Tractive effort     64,650 lbf (287.6 kN) (85%)[2]
Career
Operator(s)     Pennsylvania Railroad
Class     T1
Number in class     52
Disposition     All scrapped

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Please vist here for updates and beautiful photos:

http://prrt1steamlocomotivetrust.org/

Enjoy! :o)