Colorado & Southern / Denver, South Park & Pacific 2-6-0 "Mogul" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 17 (Locobase 7682)

Data from C & S 9-1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 713-714 in May 1882, 727-728 in June, 742-743 in July, 755-756 in August, and 782-783 in September.

The Denver, South Park & Pacific was chartered in 1873 and ran a narrow-gauge line to Leadville and Gunnison by 1888. Brooks Locomotive Works sold ten Moguls to the railroad in 1882; see Locobase 16516. After foreclosure, twelve of the narrow-gauge lines in Colorado were reorganized as the Union Pacific, Denver & Gulf in 1890.

When the Colorado & Southern was created in 1898 to take over the UP, D&G assets, it renumbered six of the ten as 17-22. According to a post to the Narrow Gauge Railroad Discussion Form by "myork" on 25 May 2010 (last accessed at [] on 23 November 2011):

"C&S #21 and #22 were Brooks moguls in name only. In the 1890s, they were re-built with new straight boilers, new frames, new drivers, new cabs, new domes, new stacks, new cylinders (note that #21 and #22 don't say "Brooks" on the cylinder casting after the rebuilds), Items such as the bell and whistle might have been original."

York goes on to describe the C & S's Mogul holdings at the time of the railroad's formation:

"[T]hey had several of the 38" drivered, wagon top boilered Brooks moguls on the roster. They had #21 and #22 which had been rebuilt to match the specs of the straight boilered Cooke moguls, and they had the Cooke moguls. Then, within the first few years, they re-boilered #4-10 with wagon top boilers. In the late teens, #4-10 received new frames as well ...frames with the same driver spacing as the long since sold/scrapped/rebuilt Brooks moguls ....but these Cooke moguls retained their 40" drivers."

John Crandall's roster on http://home.att.net/~nginfo/roster.htm records that 21 was scrapped in August 1923 while 22 went to the ferro-knacker in March 1927.


Class 4 (Locobase 16518)

Data from C&S 7-1939 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange.

According to a post to the Narrow Gauge Railroad Discussion Form by "myork" on 25 May 2010 (last accessed at [] on 23 November 2011):

York described the ways in which the 1884 Cooke Moguls (Locobase 16517) were modified after the C&S was up in 1899. "...[W]ithin the first few years, they re-boilered #4-10 with wagon top boilers. In the late teens, #4-10 received new frames as well ...frames with the same driver spacing as the long since sold/scrapped/rebuilt Brooks moguls ....but these Cooke moguls retained their 40" drivers."

Boiler pressure increased by over 2 bar and cylinders rebored to 15", a combination that generated more power, the new boiler held more tubes supplied by a larger firebox. All were retired in the 1930s.


Class D I 2 (Locobase 16517)

Data from Ross Crain, "Denver, South Park and Pacific Railroad DSP&P Brooks 2-6-0" at Crain's Denver, South Park & Pacific Railroad Pages at [], last accessed 21 November 2020, as well as his "DSP&P LOCOMOTIVE SPECIFICATIONS -- 1885 Extracts from James Ehernberger's "Union Pacific Equipment List - 1885" at https://ross-crain.com/rr_dsp8h-locospecs.htm, last accessed 21 November 2020. Works numbers were 1550-1554 in January 1884, 1555-1557 in February..

This set of Moguls offered relatively tall drivers which presumably suited them for mixed-traffic work. Not long after the Colorado & Southern was stood up in 1899, the new railroad renumbered the class 4-10 and fitted them with wagon top boilers. In the teens, a more involved upgrade substantially improved power; see Locobase 16518.


Class D J 1/ (Locobase 16516)

Data from Ross Crain, "Denver, South Park and Pacific Railroad DSP&P Brooks 2-6-0" at Crain's Denver, South Park & Pacific Railroad Pages at [], last accessed 21 November 2020, as well as his "DSP&P LOCOMOTIVE SPECIFICATIONS -- 1885 Extracts from James Ehernberger's "Union Pacific Equipment List - 1885" at https://ross-crain.com/rr_dsp8h-locospecs.htm, last accessed 21 November 2020. Works numbers were 713-714 in May 1882, 727-728 in June, 742-743 in July, 755-756 in August, 782-783 in September.

This decade of Moguls entered service as relatively small narrow-gauge locomotives. They were renumbered when the Union Pacific gained majority interest in 1885 and. But not long after they were renumbered by the Colorado & Southern, that railroad undertook one of those "overhauls" or "updates" that retained the number plates and not much else and created two new locomotives. See Locobase 7682. Most of the others were scrapped.

159 was sold in September 1898 to Burns-Biggs Lumber Company as their 1. It later went to New Mexico Lumber Company number 1. 161 was loaned to the Utah Northern in 1887, returned to C&S in 1899.

Principal Dimensions by Steve Llanso of Sweat House Media
Class174D I 2D J 1/
Locobase ID7682 16518 16517 16516
RailroadColorado & Southern (C&S)Colorado & Southern (C&S)Denver, South Park & Pacific (C&S)Denver, South Park & Pacific (C&S)
CountryUSAUSAUSAUSA
Whyte2-6-02-6-02-6-02-6-0
Number in Class67810
Road Numbers17-224-1039-40, 69-74/109-11629-38/156-165/21, 17, 22, 19-20
Gauge3'3'3'3'
Number Built6810
BuilderC&SC&SCookeBrooks
Year1898191518841882
Valve GearStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.9010 / 3.05 9.50 / 2.90 9.50 / 2.90
Engine Wheelbase (ft / m)15.58 / 4.7516 / 4.8815.50 / 4.7215.33 / 4.67
Ratio of driving wheelbase to overall engine wheelbase 0.61 0.63 0.61 0.62
Overall Wheelbase (engine & tender) (ft / m)46.92 / 14.3046.92 / 14.3037.50 / 11.4335.83 / 10.92
Axle Loading (Maximum Weight per Axle) (lbs / kg)18,700 / 8482
Weight on Drivers (lbs / kg)55,000 / 24,94864,800 / 29,39350,200 / 22,77041,000 / 18,597
Engine Weight (lbs / kg)63,250 / 28,69074,400 / 33,74758,300 / 26,44446,960 / 21,301
Tender Loaded Weight (lbs / kg)47,166 / 21,39449,250 / 22,339
Total Engine and Tender Weight (lbs / kg)110,416 / 50,084123,650 / 56,086
Tender Water Capacity (gals / ML)2000 / 7.582000 / 7.581600 / 5.991581 / 5.99
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)5 / 55 / 55 / 44 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.5036 / 1828 / 1423 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 101640 / 101640 / 101638 / 965
Boiler Pressure (psi / kPa)160 / 11190 / 13.10140 / 9.70140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)15" x 18" / 381x45715" x 18" / 381x45714.5" x 18" / 368x45715" x 18" / 381x457
Tractive Effort (lbs / kg)13,770 / 6245.9716,352 / 7417.1511,259 / 5107.0012,683 / 5752.92
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99 3.96 4.46 3.23
Heating Ability
Tubes (number - dia) (in / mm)162 - 2" / 51196 - 2" / 51160 - 1.75" / 44126 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)8 / 2.44 8.19 / 2.50 8.08 / 2.46 7.33 / 2.23
Firebox Area (sq ft / m2)85.20 / 7.92100.20 / 9.31 / 8.69
Grate Area (sq ft / m2)13.10 / 1.2214.70 / 1.3713.30 / 1.24 8.25 / 0.77
Evaporative Heating Surface (sq ft / m2)757 / 70.35941 / 87.42764 / 75.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)757 / 70.35941 / 87.42764 / 75.81
Evaporative Heating Surface/Cylinder Volume205.71255.71222.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2096279318621155
Same as above plus superheater percentage2096279318621155
Same as above but substitute firebox area for grate area13,63219,038
Power L134294963
Power MT412.34506.55

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