page_title: Chicago and North Western class D
section_title: Service
hierarchical_section_title: Chicago and North Western class D / Service
caption_attribution_description: Chicago &amp; North Western RR "D" Class 4-4-2 No.1015, built by ALCO 1900, at the National Museum of Transport St Louis, 8/70. 91 "D's" were built 1900-08 and were one of the earliest designs with piston valves and Walschaerts valve gear, although 10 built in 1908 had Young rotary valves.
context_page_description: 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 bought seven, classifying them as class G-3
context_section_description: 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.
  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. 
  Retirements started in 1931, and continued until the end of steam in 1956 when the last two were retired from Chicago commuter service.
  One locomotive has been preserved: CNW 1015, the first locomotive built. It is on display at the National Museum of Transportation at Kirkwood, Missouri.
caption: CNW 1015 at the Museum of Transportation in 1970
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