The ugliest duckling of them all. Leased CB&Q #537, in Denver, 1930. This engine had just been rebuilt by the C&S shops using many parts from set-aside and scrapped engines. She was converted to burn coal for use on the mainline to Leadville, and had switched tenders with the now oil-burning No.70. The steel cab sides are dimensionally identical to the 74-76. Similar to the D&RGW C-21 class engines, she outweighed the 74-76 by 3,000 lbs (total engine and tender) but only generated a tractive effort of 20,800 lbs., compared to 21,170 of the B-4-F class. She was not a popular engine to fire on the C&S, as she had a big, square firebox. 5/20/30. Otto Perry Photo, DPL collection.

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