Chicago and North Western class D

The Chicago and North Western Railway class D was a class of 92 American 4-4-2 "Atlantic" locomotives. They were built by Schenectady Locomotive Works and by its corporate successor the American Locomotive Company between 1900 and 1908. In addition, the Chicago, St. Paul, Minneapolis and Omaha Railway (Omaha Road) bought seven, classifying them as class G-3

CNW class D
Omaha Road class G-3
CNW 1026, one a batch of locomotives fitted with Young valve gear and Young rotary valves.
Type and origin
Power typeSteam
Builder
Serial numbersee table
Build date1900–1908
Total produced92 (CNW) 7
Specifications
Configuration:
​
 • Whyte4-4-2
 • UIC2′B1′ n2
DriverSecond
Gauge4 ft 8 1⁄2 in (1,435 mm)
Leading dia.37 1⁄4 in (0.946 m)
Driver dia.81 in (2.057 m)
Trailing dia.49 in (1.245 m)
Wheelbase:
 • Engine		26 ft 9 in (8.15 m)
 • Drivers84 in (2.13 m)
 • Tender20 ft 0 in (6.10 m)
 • Tender truck5 ft 2 in (1.575 m)
Height15 ft 1 5⁄8 in (4.613 m) over chimney
Firebox type 
 • Firegrate area46.22 sq ft (4.294 m2) (102 in × 65 1⁄4 in or 2.59 m × 1.66 m)
Boiler:
​
 • Pitch9 ft 3 in (2.82 m)
 • Diameter68 1⁄2 in (1.74 m)
Boiler pressure200 lbf/in2 (1,400 kPa; 14 kgf/cm2)
CylindersTwo
Cylinder size20 in × 26 in (508 mm × 660 mm)
Valve gearStepehenson, Young, or Walschearts
Valve typePiston valves, or Young rotary valves
Performance figures
Tractive effort25,700 lbf (114.32 kN)
Career
Operators
  • Chicago and North Western Railway
  • Omaha Road
Class
  • CNW: D
  • CMO: G-3
(Omaha Road)
Number in class
  • CNW: 92
  • CMO: 7
Numberssee tables
Retired1931–1952
PreservedCNW 1015
DispositionOne preserved, remainder scrapped

Design

The locomotives had a boiler pressed to 200 pounds-force per square inch (1.38 MPa) providing steam to two cyliners with a 20-inch (508 mm) bore and a 26-inch (660 mm) stroke. They were connected to 81-inch (2,057 mm) driving wheels by a variety of valve gear: most had Stephenson valve gear and 11-inch (279 mm) piston valves; No. 1026 was fitted up with Youngs rotary valves and valve gear in 1903,[1] but later reverted to Stephensons valve gear. The 1908 batch had Walschaerts valve gear, the first five locomotives having piston valves and the last ten were delivered with Young rotary valves; these were replaced with piston valves when the locomotives were fitted with superheaters.[2]

Construction

All 92 locomotives were built by Schenectady Locomotive Works and by the same works under its corporate successor, the American Locomotive Company.

Service

At the time of their introduction, wooden cars were the norm. The class D locomotives were quite capable of pulling a 10-car, 400-ton train on the 138-mile Chicago to Clinton route in 3 hours 25 minutes inclusive of eleven stops.[5]

Unfortunately, steel cars came into use soon after, and the locomotives became outclassed. They were then downgraded to commuter service and locals.

On the Omaha Road, one of the later uses of their class G-3 was powering the Minneapolis to Ashland train The Namakagon substituting for the regular gas-electric car when it was in the shops or the load exceeded its two-car capacity.[6]

Retirements started in 1931, and continued until the end of steam in 1956 when the last two were retired from Chicago commuter service.

CNW 1015 at the Museum of Transportation in 1970

One locomotive has been preserved: CNW 1015, the first locomotive built. It is on display at the National Museum of Transportation at Kirkwood, Missouri.

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References
  1. Swingle (1916), p. 196.
  2. Cole (1938), p. 70.
  3. Cole (1938), pp. 61–62.
  4. Mailer (2005), p. 305.
  5. Barrie, Wes. "Chicago & North Western / Chicago, St Paul, Minneapolis & Omaha 4-4-2 "Atlantic" Locomotives in the USA". steamlocomotive.com. Retrieved 2020-05-24.
  6. Mailer (2005), p. 257.
  7. Chicago and North Western Railway (1948), pp. 14–17.

Bibliography
  • Barrie, Wes. "Chicago & North Western / Chicago, St Paul, Minneapolis & Omaha 4-4-2 "Atlantic" Locomotives in the USA". steamlocomotive.com. Retrieved 2020-05-24.
  • Cole, F.A. (1938). Locomotives of the Chicago & North Western Railway. Boston: The Railway & Locomotive Historical Society.
  • Chicago and North Western Railway (1948). Locomotives of the Chicago & North Western Railway, supplement. The Railway & Locomotive Historical Society.
  • Drury, George H. (1985). The Historical Guide to North American Railroads. Milwaukee, Wisconsin: Kalmbach Publishing Company. ISBN 0-89024-072-8. LCCN 85080107.
  • A. C. Kalmbach, ed. (1950). Model Railroader Cyclopedia (6th ed.). Milwaukee, Wisconsin: Kalmbach Publishing Company. p. 41.
  • Mailer, Stan (2005). Omaha Road: Chicago, St. Paul, Minneapolis & Omaha. Mukilteo, Washington: Hundman Publishing. ISBN 0-945434-04-9.
  • Swingle, Calvin F. (1916). Cyclopedia of Locomotive Engineering. Chicago: Frederick J. Drake & Co. for Sears, Roebuck & Co.

See also
  • "New Class D Passenger Locomotives for the Chicago & Northwestern". Railroad Gazette. XXXII: 519–520. August 3, 1900.


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