The Lehigh Valley gave its 4-8-4 type locomotives a local name, rather than the "Northern" designation. The name "Wyoming" was selected. The Wyoming Valley is a historic section of the Susquehanna Valley that is served by the railroad.
In 1934, five heavier 4-8-4s were delivered by Baldwin as dual purpose locomotives. They were designated Class T-3 and assigned road numbers 5125 through 5129. They had 77" drivers, 27 x 30 cylinders, a boiler pressure of 275 lbs, a tractive effort of 66,500 lbs and weighed 441,400 pounds.
During World War II, the Lehigh Valley needed additional motive power but because of wartime restrictions, it could not build newly designed locomotives. Therefore, 10 duplicates of the Class T-2a Wyomings were ordered from ALCO and delivered in 1943. They were very similar to the older Class T-2a locomotives except they were 17,000 lbs heavier.
There are no surviving LV "Wyomings".
|Class||Road Numbers||Builder||Year Built|
|T-1a||5100 - 5110||BLW||1931, 32|
|T-2a||5200 - 5210||ALCO||1931, 32|
|T-2b||5211 - 5220||ALCO||1943|
|T-3||5125 - 5129||BLW||1934, 35|
Known as "Wyomings" in Lehigh Valley service and intended for heavy fast trains over maximum grades of 1 1/2%. When fitted, an unusually powerful trailing-truck booster added 18,000 lb (8,165 kg) to the starting tractive effort.
Chris Hohl noted some differences between the 1931 loner and the ten engines supplied a year later: "5100 had Walschaert valve gear, and an Elesco K-50 feed water heater at the top/crown of smokebox ... her tender weighed 363,000 lbs. Her tender capacities were 28 tons [25.45 metric tons] & 18,000 gallons [68,130 litres]." The Baldwin specs estimated a total engine weight for the 5100 of 425,000 lb (192,777 kg), but the LV diagrams report 408,000 lb (185,066 kg).
Production T-1s used a Worthington feed water heater and actuated the 12" (305 mm) piston valves with Baker gear. In all, the firebox's heating surface area included 143 sq ft (13.3 sq m) in Nicholson thermic syphons, three in the firebox and one in the combustion chamber. An additional 92 sq ft (8.5 sq m) came from the shell of the chamber. A Standard BK stoker fed the coal. The front truck (bogie) axles turned in Timken roller bearings; it weighed 5,070 lb (2,300 kg) more than the one under the 5100.
The Lehigh Valley laid out the schedule it expected this engine to keep from Frontier (near Niagara Falls, NY) to Tidewater (Jersey City, NJ) while hauling 3,000 short tons:
Suspension Bridge to Manchester 3 hours 30 minutes
Buffalo to Manchester 3 hours 0 minutes
Manchester to Sayre (Pa) 3 hours 0 minutes
Sayre to Coxton 2 hours 15 minutes
Coxton to Mahoning (Pa) 3 hours 0 minutes
Mahoning to Jersey City (NJ) 4 hours 0 minutes
These 11 locomotives consisted of the Schenectady prototype and the 1932 batch of Wyomings. 5100 appeared at the same time as Baldwin's T-1 and had roughly the same characteristics. Intriguing differences included a different path to very similar amount of cylinder volume. Alco's cylinders measured an inch less in diameter, but allowed two more inches of stroke.
Like the Baldwin T-1 prototype shown in Locobase 263, this Schenectady rival used an Elesco feed water heater and carried the characteristic cylinder over 5200's headlight. The 5200's combustion chamber was 6" (152 mm) longer than that of the T-1 (prototype and production) and the engine wheelbase was 8" (203 mm) longer. Firebox heating surface included 131 sq ft (12.7 sq m) of arch tubes in the firebox and Nicholson thermic syphons in the firebox and combustion chamber. The class used one of the most powerful trailing-truck boosters ever fitted to a locomotive--one adding 18,360 lb (8,328 kg) to the starting tractive effort.
Eleven years later, Alco delivered ten T-2b with very few differences; see Locobase 265.
The first eleven Alco Wyomings were built for the Lehigh Valley in 1931 and 1932; their description appears in Locobase 16286.
T-2bs came a decade later and repeated the design with some detail differences. One of these was a reduction in the number of small tubes. At the same time, superheater area decreased by 148 sq ft (13.75 sq m) and the firebox heating surface included 131 sq ft (12.7 sq m) of arch tubes in the firebox and Nicholson thermic syphons in the firebox and combustion chamber. Trailing truck booster tractive effort shrank from 18,360 lb (8,328 kg or 81.67 kN) to 12,300 lb (5,579 kg or .54.71 kN). Spoked drivers were replaced by Boxpoks on all four driving axles.
Most of the changes probably reflected limited availabilities of materials and components, which meant using heavier steel and reducing demands on already stretched maintenance staff.
Obviously based on Baldwin's T-1s of 1931-1932, this quintet had taller drivers, boiler pressed to a higher PSI, and a larger grate. Firebox had thermic syphons and the boiler had a Worthington feed water heater.
Drury (1993) says that these Wyomings weren't passenger engines, but "occasionally pulled milk trains, where their high drivers were useful -- a slow milk train can quickly become a yogurt train." They would also head up the famous Black Diamond express train.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Lehigh Valley (LV)||Lehigh Valley (LV)||Lehigh Valley (LV)||Lehigh Valley (LV)|
|Number in Class||11||11||20||5|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||19.25 / 5.87||19.25 / 5.87||19.25 / 5.87||20 / 6.10|
|Engine Wheelbase (ft / m)||44.92 / 13.69||45.58 / 13.89||45.58 / 13.89||45.92 / 14|
|Ratio of driving wheelbase to overall engine wheebase||0.43||0.42||0.42||0.44|
|Overall Wheelbase (engine & tender) (ft / m)||94.87 / 28.92||95.46 / 29.10||95 / 28.96||95.17 / 29.01|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||67,500 / 30,618||68,300 / 30,980|
|Weight on Drivers (lbs / kg)||270,000 / 122,470||268,000 / 121,563||374,500 / 169,871||272,200 / 123,468|
|Engine Weight (lbs / kg)||413,170 / 187,411||422,000 / 191,416||451,000 / 204,570||435,000 / 197,313|
|Tender Loaded Weight (lbs / kg)||398,300 / 180,666||358,800 / 162,749||389,100 / 176,493||389,000 / 176,448|
|Total Engine and Tender Weight (lbs / kg)||811,470 / 368,077||780,800 / 354,165||840,100 / 381,063||824,000 / 373,761|
|Tender Water Capacity (gals / ML)||20,000 / 75.76||18,000 / 68.18||20,000 / 75.76||20,000 / 75.76|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||30 / 27.30||28 / 25.50||30 / 27.30||30 / 27.30|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||113 / 56.50||112 / 56||156 / 78||113 / 56.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||70 / 1778||70 / 1778||70 / 1778||77 / 1956|
|Boiler Pressure (psi / kPa)||250 / 17.20||255 / 17.60||255 / 17.60||275 / 19|
|High Pressure Cylinders (dia x stroke) (in / mm)||27" x 30" / 686x762||26" x 32" / 660x813||26" x 32" / 660x813||27" x 30" / 686x762|
|Tractive Effort (lbs / kg)||66,391 / 30114.49||66,982 / 30382.56||66,982 / 30382.56||66,391 / 30114.49|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.07||4.00||5.59||4.10|
|Firebox Area (sq ft / m2)||490 / 45.52||508 / 47.19||494 / 45.89||507 / 47.10|
|Grate Area (sq ft / m2)||88.30 / 8.20||88.30 / 8.20||88.30 / 8.20||96.50 / 8.97|
|Evaporative Heating Surface (sq ft / m2)||5422 / 503.72||5441 / 505.48||5376 / 499.44||5439 / 505.30|
|Superheating Surface (sq ft / m2)||2256 / 209.59||2243 / 208.38||2095 / 194.63||2056 / 191.01|
|Combined Heating Surface (sq ft / m2)||7678 / 713.31||7684 / 713.86||7471 / 694.07||7495 / 696.31|
|Evaporative Heating Surface/Cylinder Volume||272.73||276.70||273.39||273.59|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22,075||22,517||22,517||26,538|
|Same as above plus superheater percentage||28,477||29,046||28,821||33,703|
|Same as above but substitute firebox area for grate area||158,025||167,107||161,242||177,070|