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 engines were built in two batches --10 in 1932 and 10 in 1943. The T-2a were delivered at the same time Baldwin supplied its T-1s (Locobase 263). Compared to the Baldwins, these Alcos had less cylinder volume, longer combustion chambers, slightly less adhesion weight but almost six tons more engine weight. 5200-5205 carried the Elesco feed water heater in its customary position above the smokebox; 5206-5210 used Worthingtons.
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.
T-2bs came a decade later and repeated the design with some detail differences and a small gain in adhesion weight (to 274,500 lb/124511 kg) and a larger rise in engine weight (to 451,000 lb/204,570 kg).
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.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Lehigh Valley (LV)||Lehigh Valley (LV)||Lehigh Valley (LV)|
|Number in Class||11||20||5|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||19.25||19.25||20|
|Engine Wheelbase (ft)||44.92||45.58||45.92|
|Ratio of driving wheelbase to overall engine wheebase||0.43||0.42||0.44|
|Overall Wheelbase (engine & tender) (ft)||94.87||95||95.17|
|Axle Loading (Maximum Weight per Axle) (lbs)||67,500||68,300|
|Weight on Drivers (lbs)||270,000||269,000||272,200|
|Engine Weight (lbs)||413,170||424,000||435,000|
|Tender Loaded Weight (lbs)||398,300||389,100||389,000|
|Total Engine and Tender Weight (lbs)||811,470||813,100||824,000|
|Tender Water Capacity (gals)||20,000||20,000||20,000|
|Tender Fuel Capacity (oil/coal) (gals/tons)||30||30||30|
|Minimum weight of rail (calculated) (lb/yd)||113||112||113|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||70||70||77|
|Boiler Pressure (psi)||250||255||275|
|High Pressure Cylinders (dia x stroke) (in)||27" x 30"||26" x 32"||27" x 30"|
|Tractive Effort (lbs)||66,391||66,982||66,391|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.07||4.02||4.10|
|Firebox Area (sq ft)||490||494||507|
|Grate Area (sq ft)||88.30||88.30||96.50|
|Evaporative Heating Surface (sq ft)||5422||5376||5439|
|Superheating Surface (sq ft)||2256||2095||2056|
|Combined Heating Surface (sq ft)||7678||7471||7495|
|Evaporative Heating Surface/Cylinder Volume||272.73||273.39||273.59|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22,075||22,517||26,538|
|Same as above plus superheater percentage||28,477||28,821||33,703|
|Same as above but substitute firebox area for grate area||158,025||161,242||177,070|