Lehigh Valley Class K6b 4-6-2 "Pacific" Steam Locomotive

The Lehigh Valley Railroad Class K6b consisted of twelve 4-6-2 "pacific"-type steam locomotives. Some of these units were built by Baldwin, and some by Alco Brooks. Three of these locomotives were streamlined in casings designed by Otto Kuhler in 1939 and 1940 to haul the Lehigh Valley's "Black Diamond" passenger train. Road numbers for the streamlined units were 2089, 2093, and 2097.

The Otto Kuhler-designed casings feature black and red valances and were trimmed with white pinstripes. All of the top hamper (domes, stack, safety valve stand) were encased in a narrow shroud that ended at the edge of the smokebox. The locomotive had a cone-shaped fairing that capped the front of the smokebox.

The firebox on these engines had a combustion chamber, and had axle loadings nearly four tons lighter than those of the K 5-1/2. They also had a 10,400 lb booster to increase the starting tractive effort. Lehigh Valley's Sayre shops converted two K-3s to K-6bs in June 1925 and August 1926; these had the two lowest road numbers of the class.

Lehigh Valley Class K6b Overview

Type and Origin
Power type: Steam
Original Builders: Baldwin, Alco Brooks
Original build date: 1924
Original Build Date K3 Class: 1916
Road Numbers: 2088-2099
Number in Class: 12
Total Units Streamlined: 3
Original Class: K3s - 2088, 2089, 2090
Rebuild date: 1925 -1926
Rebuilt by: Lehigh Valley Sayre shop
Original Builder Streamlined Units: Baldwin Locomotive Works
Year Streamlined: 1939-1940
Road Numbers Streamlined Units: 2089, 2093, 2097
​ • Whyte 4-6-2 "Pacific"
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 77"  (1,956 mm)
Wheelbase: 36.50' (11.13 m) 
Weight on drivers: 181,000 lbs  (82,100 kg) 
Locomotive Weight: 291,000 lbs  (131,996 kg)
Tender Loaded Weight: 197,500 lbs  (89,585 kg)
Total Locomotive with Tender Weight: 488,500 lbs  (221,581 kg)
Fuel type: Coal
Fuel capacity: 15 tons (13.60 mt)
Water capacity: 10,500 gals  (39.77 ml) 
Firebox area: 328 sq ft  (30.48 sq m)
 • Fire grate area: 75.30 sq ft  (7 sq m)
 • Evaporative Heating Surface: 3,285 sq ft (305.30 sq m)
 • Superheating Surface: 945 sq ft  (87.83 sq m)
 • Combined Heating Surface: 4230 sq ft  (393.13 sq m)
Boiler pressure: 215 psi  (14.80 kPa) 
Cylinders: 2
Cylinder size: 25" x 28"  (635 x 711 mm)
Valve gear: Baker
Performance figures
Tractive effort: 41,534 lbs  (18839.53 kg)
Factor of Adhesion: 4.36
Operator: Lehigh Valley Railroad
Class: K6b
Preserved: None.
Disposition: All scrapped.

See also:

Lehigh Valley K5-1/2 Class Locomotive

Streamlined Steam Locomotives

Lehigh Valley Railroad

Black Diamond Passenger Train

4-6-2 "Pacific" Locomotive

Steam Locomotives


Lehigh Valley K6b Class No. 2097.

Lehigh Valley K6b Class No. 2097.

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