Baldwin works #7756, 7758, 7765 were noted in this diagram book; Locobase doesn't know if there were others in the class. At the time of publication in 1914, the boiler was pressed to a very low degree even for the year of introduction. The entire design looks like an attempt to exploit a compact arrangement to derive some additional adhesion weight.
Considerably bigger Mogul built years later than the St J & G I's first set. By now the firebox rides over the rear axle and the boiler has swollen and has a coned second course.
In the same year as the narrow-gauge Eight-wheeler shown in Locobase 7834 came this even tinier Mogul. It's difficult to believe the dimensions, but they all check out.
| Specifications | ||||
|---|---|---|---|---|
| Class | 23 | 41 | M-43 | M-57 |
| Locobase ID | 6576 | 6579 | 7836 | 7837 |
| Railroad | St.Joseph & Grand Island (UP) | St.Joseph & Grand Island (UP) | Oregon-Washington RR & Navigation (UP) | Oregon-Washington RR & Navigation (UP) |
| Whyte | 2-6-0 | 2-6-0 | 2-6-0 | 2-6-0 |
| Road Numbers | 23-25 | 41-45 | 1 | |
| Gauge | Std | Std | 3' | Std |
| Builder | Burnham, Parry, Williams & Co | Burnham, Williams & Co | ||
| Year | 1885 | 1904 | 1880 | 1889 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Stephenson |
| Locomotive Length and Weight | ||||
| Driver Wheelbase | 15.40' | 15' | 11.67' | 15.67' |
| Engine Wheelbase | 23.40' | 23.25' | 17.67' | 23.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.66 | 0.65 | 0.66 | 0.66 |
| Overall Wheelbase (engine & tender) | 51.60' | 50' | 35.79' | 46.62' |
| Axle Loading (Maximum Weight per Axle) | 33060 lbs | 49480 lbs | 11600 lbs | 31500 lbs |
| Weight on Drivers | 81320 lbs | 138000 lbs | 33800 lbs | 91500 lbs |
| Engine Weight | 96760 lbs | 158800 lbs | 42000 lbs | 108100 lbs |
| Tender Light Weight | 108000 lbs | 123650 lbs | 48166 lbs | 87316 lbs |
| Total Engine and Tender Weight | 204760 lbs | 282450 lbs | 90166 lbs | 195416 lbs |
| Tender Water Capacity | 5280 gals | 4000 gals | ||
| Tender Fuel Capacity (oil/coal) | 11 tons | 12 tons | tons | tons |
| Minimum weight per yard of rail on which locomotive could run | 45.18 lb rail | 76.67 lb rail | 18.78 lb rail | 50.83 lb rail |
| Geometry Relating to Tractive Effort | ||||
| Driver Diameter | 57" | 57" | 42" | 57" |
| Boiler Pressure | 125 psi | 200 psi | 125 psi | 155 psi |
| Cylinders (dia x stroke) | 18" x 24" | 20" x 26" | 12" x 18" | 18" x 24" |
| Tractive Effort | 14495 lbs | 31018 lbs | 6557 lbs | 17973 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.61 | 4.45 | 5.15 | 5.09 |
| Heating Ability | ||||
| Firebox Area | 121 sq. ft | 138 sq. ft | 64.50 sq. ft | 125.70 sq. ft |
| Grate Area | 16.50 sq. ft | 44 sq. ft | 7.99 sq. ft | 16.80 sq. ft |
| Evaporative Heating Surface | 1395 | 1900 | 392 | 1574 |
| Superheating Surface | ||||
| Combined Heating Surface | 1395 | 1900 | 392 | 1574 |
| Evaporative Heating Surface/Cylinder Volume | 197.35 | 200.98 | 166.37 | 222.68 |
| Computations Relating to Power Output (More Information) | ||||
| Robert LeMassena's Power Computation | 2062.50 | 8800 | 998.75 | 2604 |
| Same as above plus superheater percentage | 2062.50 | 8800 | 998.75 | 2604 |
| Same as above but substitute firebox area for grate area | 15125 | 27600 | 8062.50 | 19483.50 |
| Power L1 | 3359.94 | 5205.28 | 2653.38 | 4588.16 |
| Power MT | 273.27 | 249.47 | 519.20 | 331.64 |
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