N&W Class K2 streamlined 4-8-2 No. 123 at Richmond, Virginia.

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N&W Class K2 streamlined 4-8-2 No. 123 at Richmond, Virginia.
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N&W Class K2 and K2a Streamlined 4-8-2 Mountain Steam Locomotive
The Norfolk & Western K2 and K2a Class steam locomotives were a group of 22 4-8-2 "Mountain" type locomotives. Ten USRA Heavy Mountain locomotives were built by Alco Brooks in 1919 and twelve more 4-8-2s were built by Baldwin in 1923. In the mid to late 1940's, some of the units were streamlined in the same style as the N&W's J-Class 4-8-4 locomotives. The K2s were also fitted with Timkin roller bearings except on the drivers, and also received new fireboxes and stokers along with new cylinders. The class was eventually retired and scrapped between 1957 and 1959.

C & O Class K2 and K2a Overview
Type and Origin
Power type: Steam
Original Builders: Alco Brooks, Baldwin
Original build date Alco Brooks units: 1919

Original build date Baldwin units: 1923
Rebuilt by: N&W Railway Roanoke Shops
Total Units Streamlined: ?
Rebuild date: December 1944 - ?
Road Numbers Alco Brooks units: 116 -125
Road Numbers Baldwin units: 126-137
Road Numbers streamlined units: 116-125, 126, 127, 128, 129,135, ?
​ • Whyte 4-8-2 "Mountain"
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 70"  (1,778 mm)
Wheelbase: 40.00' (12.19 m)
Weight on drivers: 248,150 lbs  (112,559 kg)
Locomotive Weight: 359,460 lbs  (163,049 kg)
Tender Loaded Weight: 378,600 lbs  (171,730 kg)
Total Locomotive with Tender Weight: 738,060 lbs  (334,779 kg)
Fuel type: Coal
Fuel capacity: 30 tons (27.30 mt)
Water capacity: 22,000 gals  (83.33 ml)
Firebox: 369 sq ft  (34.29 sq m)
 • Firegrate area: 76.30 sq ft  (7.09 sq m)
Boiler pressure: 220 psi  (15.20 kPa)
Cylinders: 2
Cylinder size: 28" x 30"  (711 x 762 mm)
Valve gear: Baker
Performance figures
Tractive effort: 62,832 lbs  (28,500.15 kg)
Factor of Adhesion: 3.95
Operator: Norfolk & Western Railway (N&W)
Class, Alco units: K2
Class, Baldwin units: K2a
​Withdrawn: 1957 - 1959
Preserved: None.
Disposition: All scrapped.

See also:

N&W J-Class 4-8-4

Norfolk and Western Railway

American Locomotive Company

Baldwin Locomotive Works

Streamlined Steam Locomotives

Steam Locomotives