loco-info.com - Lehigh Valley classes T-1 to T-3

T-2b No. 5215 while taking water

collection Taylor Rush

The Lehigh Valley used the 4-8-4, which they dubbed “Wyoming” after the Wyoming Valley in Pennsylvania, primarily for freight trains. After one prototype each from Baldwin and ALCO, ten more were procured as T-1a and T-2a. These had the most powerful booster of all US steam locomotives in the rear bogie. The T-3 was built by Baldwin from 1934 and was also suitable for passenger trains with larger wheels. The T-2b first emerged during World War II and was derived from the T-2a. Due to the lack of material, however, this was less refined and thus weighed more heavily.

Variant	T-1a	T-2a	T-2b	T-3

General
Built	1931-1932		1943	1934-1935
Manufacturer	Baldwin	ALCO		Baldwin
Axle config	4-8-4 (Northern)
Gauge	4 ft 8 1/2 in (Standard gauge)

Dimensions and Weights
Wheelbase	44 ft 11 in	45 ft 7 in		45 ft 11 in
Rigid wheelbase	19 ft 3 in			20 ft
Total wheelbase	94 ft 10 1/2 in	95 ft 5 1/2 in	95 ft	95 ft 2 in
Service weight	413,170 lbs	422,000 lbs	451,000 lbs	435,000 lbs
Adhesive weight	270,000 lbs	268,000 lbs	274,500 lbs	272,200 lbs
Total weight	811,470 lbs	780,800 lbs	840,100 lbs	824,000 lbs
Axle load	67,500 lbs	67,000 lbs	68,625 lbs	68,300 lbs
Water capacity	20,000 us gal	18,000 us gal	20,000 us gal
Fuel capacity	60,000 lbs (coal)	56,000 lbs (coal)	60,000 lbs (coal)

Boiler
Grate area	88.3 sq ft			96.5 sq ft
Firebox area	490 sq ft	508 sq ft	494 sq ft	507 sq ft
Tube heating area	4,932 sq ft	4,933 sq ft	4,882 sq ft	4,932 sq ft
Evaporative heating area	5,422 sq ft	5,441 sq ft	5,376 sq ft	5,439 sq ft
Superheater area	2,256 sq ft	2,243 sq ft	2,095 sq ft	2,056 sq ft
Total heating area	7,678 sq ft	7,684 sq ft	7,471 sq ft	7,495 sq ft

Variant	T-1a	T-2a	T-2b	T-3

Power Plant
Driver diameter	70 in		77 in
Boiler pressure	250 psi	255 psi	275 psi
Expansion type	simple
Cylinders	two, 27 x 30 in	two, 26 x 32 in	two, 27 x 30 in

Power
Power source	steam
Estimated power	4,400 hp (3,281 kW)	4,475 hp (3,337 kW)	4,600 hp (3,430 kW)	5,000 hp (3,729 kW)
Optimal speed	42 mph	43 mph	44 mph	48 mph
Starting effort	66,391 lbf	66,982 lbf		66,391 lbf
Booster	18,360 lbf		12,300 lbf

Calculated Values
Factor of adhesion	1 : 4.07	1 : 4.00	1 : 4.10
Power-to-weight ratio	0.0106 hp/lb		0.0102 hp/lb	0.0115 hp/lb
Heating Area Equivalent	12,384 sq ft	12,467 sq ft	12,036 sq ft	12,086 sq ft
Cylinder volume/HAE	1 : 489.30	1 : 486.05	1 : 503.45	1 : 501.37
Adhesive weight/Total	1 : 1.53	1 : 1.57	1 : 1.64	1 : 1.60
Tractive force/Heating area	1 : 1946.29	1 : 1962.06	1 : 2017.19	1 : 1991.36
Grate area/Heating area	1 : 81.41	1 : 81.27	1 : 79.02	1 : 72.42
Firebox/Tube area	1 : 14.67	1 : 14.13	1 : 14.12	1 : 13.78
Total/Superheater	1 : 2.40	1 : 2.43	1 : 2.57	1 : 2.65

steam locomotive

freight

passenger

express

booster

last changed: 03/2023

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