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Colorado & Southern Mogul

It was once stated that if all model railroads truly reflected their prototypes then at least one half of the total railway mileage in the United States must have been narrow gauge.  In actual fact, less than 1% of US railroads were narrow gauge, but the spectacular beauty of both the railroads and the locomotives that operated over them has captured the imagination of railroad enthusiasts everywhere.  No narrow gauge line has sparked more interest than three-foot gauge 'Little Giants' that conquered Colorado's Rocky Mountains. 

Most of what was to become the Denver and Rio Grande Railroad was initially constructed by several small construction firms.  With routes out of Denver, to the south, blocked by Santa Fe, these companies turned west toward the rugged Rocky Mountains.  In order to traverse such rough terrain, engineers implemented such innovations as spiraling loops, steep grades and extremely long tunnels. It was decided that three-foot gauge would provide the most economical solution to the construction problem since powerful yet compact engines could be built.  The Union Pacific was supporting two Colorado narrow gauge lines during the 1870 - 1888 time period, the Colorado Central and the Denver, South Park & Pacific.   

In the early 1880's the UP purchased sixteen identical 2-6-0's from the Brooks Locomotive Works of Dunkirk, NY, for use on these narrow gauge lines.   The locomotives were fitted with Stephenson valve gear driving slide-valves and were coal-fired.  In 1898, the UP returned the Denver, South Park & Pacific to independent status and, after some reshuffling, it emerged in 1902 as the Colorado and Southern.  By then, all but two of the Brooks Moguls had been scrapped; South Park No. 35 was rebuilt into Colorado & Southern No. 22.  Eventually, this locomotive was withdrawn from service in 1927 and scrapped. 

ASTER modeled the C&S No. 22 as she appeared later in her career during the mid 1920's.  A scale of 1/22.5 was chosen so that it would be compatible with G Scale rolling stock and accessories.


Scale/Gauge  1/22.5, No. 1 (45 mm) Gauge

Weight  5.8 kg. (12.8 pounds)


Length 643.6 mm (25.36 inches)

            Width 106 mm (4.17 inches)

            Height 206.8 mm (8.15 inches)

Wheel Arrangements  2-6-0  Mogul

Driving Wheel  Dia. 45 mm  (Eccentric Cam for axle pump mounted)

Pilot Truck Wheel  Dia. 27 mm

Engine  Two Cylinders

(Bore 12 mm x Stroke 18 mm)

Valve Gear  Walschaert's 

Boiler Type  Center Flue  Type

Water Capacity  180 cc at 80% full

Working Pressure  3-4 kg/cm

Fittings  2 Safety Valves (one in the dome and one in the cab)

Pressure Gauge, Water Gauge, Throttle Valve, Blower Valve, Check Valve, Auxiliary Gas Reservoir

Fuel   Butaine Gas

Lubricator  Roscoe Displacement Type

Tender   Water Tank Capacity  200 cc (Hand Pump Fitted)

Gas Tank  Capacity at 60 cc at 80% Full

Minimum Radius  2.0 m  (6 feet) dia. 4 m (13 feet)

Radio Control   Provision Made for a Single Channel R.C Equipment

Coupler  Open Jaw Knuckle Coupler


Electric Version


D.C. Motor x 1          Rated Voltage 12 V  / Rated Ampere 2 A

Speed  5,200 rpm

Transmission System  Spur Gear (Wheels Free To Rotate)

Gear Ratio  1/19 (From Motor to Driver)

Engine Speed  Meter

Drawbar Pull  1.3 kg at Tender

Lights  Rated Voltage 15 / Rated Ampere 0.9

Engine 1 x Head Light 1 x Cab Light

Tender 2 x Market Lights 2 





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