Lehigh Valley 4-8-4 "Northern" Type Locomotives

Class T-1 (Locobase 263)

Data from LV 3-1934 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Known as "Wyomings" in Lehigh Valley service. When fitted, an unusually powerful trailing-truck booster added 18,630 lb to the starting tractive effort. The firebox contained Nicholson thermic syphons.

Class T-2/T-2B (Locobase 265)

Data from 1947 Locomotive Cyclopedia and from Data from LV 3 -1934 Locomotive Diagrams, the latter supplied in May 2005 by Allen Stanley from his extensive collection.

Firebox heating surface included 131 sq ft of thermic syphons. These engines were built in 2 batches --10 in 1932 and 10 in 1943.

Class T-3 (Locobase 264)

Firebox had thermic syphons. Drury (1993) says that these 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."

Specifications
Class	T-1	T-2/T-2B	T-3
Locobase ID	263	265	264
Railroad	Lehigh Valley	Lehigh Valley	Lehigh Valley
Whyte	4-8-4	4-8-4	4-8-4
Road Numbers	5100-5110	5201-5220	5125-5129
Gauge	Std	Std	Std
Builder	Baldwin	Alco	Baldwin
Year	1932	1932	1934
Valve Gear	Baker	Baker	Baker
	Locomotive Length and Weight
Driver Wheelbase	19.25'	19.25'	20'
Engine Wheelbase	44.92'	45.58'	45.92'
Ratio of driving wheelbase to overall engine wheebase	0.43	0.42	0.44
Overall Wheelbase (engine & tender)	94.87'	95'
Axle Loading (Maximum Weight per Axle)	67500 lbs
Weight on Drivers	270000 lbs	274500 lbs	270100 lbs
Engine Weight	413170 lbs	451000 lbs	441400 lbs
Tender Light Weight	398300 lbs	389100 lbs	389000 lbs
Total Engine and Tender Weight	811470 lbs	840100 lbs	830400 lbs
Tender Water Capacity	20000 gals	20000 gals	20000 gals
Tender Fuel Capacity (oil/coal)	30 tons	30 tons	30 tons
Minimum weight per yard of rail on which locomotive could run	112.50 lb rail	114.38 lb rail	112.54 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	70"	70"	77"
Boiler Pressure	250 psi	255 psi	275 psi
Cylinders (dia x stroke)	27" x 30"	26" x 32"	27" x 30"
Tractive Effort	66391 lbs	66982 lbs	66391 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.07	4.10	4.07
	Heating Ability
Firebox Area	490 sq. ft	494 sq. ft	507 sq. ft
Grate Area	88.30 sq. ft	88.30 sq. ft	96.50 sq. ft
Evaporative Heating Surface	5422	5376	5439
Superheating Surface	2256	2095	2056
Combined Heating Surface	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	22075	22516.50	26537.50
Same as above plus superheater percentage	28561.22	28830.52	33817.17
Same as above but substitute firebox area for grate area	158493.75	161294.21	177671.54
Power L1	41337.22	40396.31	47003.74
Power MT	1350.12	1297.76	1534.62