The Omaha Road didn't operate all that many Consolidations and this trio was supplied as singles over a three year period (works #10875 produced in May 1890, 12328 in October 1891, and 13484 in June 1893).
They were big for their time and had the large-diameter firetubes Baldwin often used for this kind of engine.
Locobase is surprised that a late-90s locomotive will still have a boiler pressure of only 160 psi. But the diagram hints at the service use of this quartet. The slope-back tender suggests a switching role. Baldwin supplied the class in two pairs: 16264-16265 in October 1898 and 18732-18733 in March 1901.
Drury (1993) characterizes these "Zulus" as "good-sized Consolidations" and notes that some came with Baker, others with Walschaerts valve gear. It's apparent that they also demonstrate the North Western's penchant for standardizing on a single class. Baldwin and Schenectady turned out the class over a 4-year period from 1909-1913, with Schenectady introducing the Zulus in 1909, Baldwin supplying 25 in August-September 1910, and Schenectady producing all of the rest in 1910-1913.
Superheating this large class of Consolidations didn't lead to a standardization of valve gear; Some still came with Baker, others with Walschaerts valve gear. Otherwise, the tack taken was typical of such upgrades: Sacrificing 190 small tubes in favor of 36 larger flues to hold the superheater, although it was a bit unusual to increase boiler pressure.
| Specifications | ||||
|---|---|---|---|---|
| Class | H-1 | H-2 | Z | Z - superheated |
| Locobase ID | 9341 | 9342 | 8951 | 4368 |
| Railroad | Chicago, St. Paul, Minneapolis & Omaha (C & NW) | Chicago, St. Paul, Minneapolis & Omaha (C & NW) | Chicago & North Western (C&NW) | Chicago & North Western (C&NW) |
| Whyte | 2-8-0 | 2-8-0 | 2-8-0 | 2-8-0 |
| Road Numbers | 211, 214, 227 | 209-210, 228-229 | 1866-1910 | 1866-1910 |
| Gauge | Std | Std | Std | Std |
| Builder | Burnham, Williams & Co | Burnham, Williams & Co | several | C& NW |
| Year | 1890 | 1898 | 1909 | 1909 |
| Valve Gear | Stephenson | Stephenson | various | various |
| Locomotive Length and Weight | ||||
| Driver Wheelbase | 14' | 14' | 17.50' | 17.50' |
| Engine Wheelbase | 22.25' | 22.33' | 26.42' | 26.42' |
| Ratio of driving wheelbase to overall engine wheebase | 0.63 | 0.63 | 0.66 | 0.66 |
| Overall Wheelbase (engine & tender) | 48.50' | 49.42' | 60.81' | 60.81' |
| Axle Loading (Maximum Weight per Axle) | ||||
| Weight on Drivers | 135000 lbs | 156275 lbs | 205000 lbs | 214500 lbs |
| Engine Weight | 150000 lbs | 170425 lbs | 232000 lbs | 243500 lbs |
| Tender Light Weight | 71900 lbs | 83700 lbs | 150900 lbs | 165700 lbs |
| Total Engine and Tender Weight | 221900 lbs | 254125 lbs | 382900 lbs | 409200 lbs |
| Tender Water Capacity | 3600 gals | 4000 gals | 7500 gals | 8275 gals |
| Tender Fuel Capacity (oil/coal) | 4.5 tons | 5 tons | 12 tons | 15 tons |
| Minimum weight per yard of rail on which locomotive could run | 56.25 lb rail | 65.11 lb rail | 85.42 lb rail | 89.38 lb rail |
| Geometry Relating to Tractive Effort | ||||
| Driver Diameter | 51" | 50" | 61" | 61" |
| Boiler Pressure | 140 psi | 160 psi | 170 psi | 185 psi |
| Cylinders (dia x stroke) | 22" x 28" | 22" x 28" | 25" x 32" | 25" x 32" |
| Tractive Effort | 31621 lbs | 36861 lbs | 47377 lbs | 51557 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 | 4.24 | 4.33 | 4.16 |
| Heating Ability | ||||
| Firebox Area | 189.50 sq. ft | 183.50 sq. ft | 214 sq. ft | 214 sq. ft |
| Grate Area | 35.30 sq. ft | 34.97 sq. ft | 52.70 sq. ft | 53 sq. ft |
| Evaporative Heating Surface | 2388 | 2453 | 3713 | 2974 |
| Superheating Surface | 610 | |||
| Combined Heating Surface | 2388 | 2453 | 3713 | 3584 |
| Evaporative Heating Surface/Cylinder Volume | 193.85 | 199.12 | 204.23 | 163.58 |
| Computations Relating to Power Output (More Information) | ||||
| Robert LeMassena's Power Computation | 4942 | 5595.20 | 8959 | 9805 |
| Same as above plus superheater percentage | 4942 | 5595.20 | 8959 | 11473.82 |
| Same as above but substitute firebox area for grate area | 26530 | 29360 | 36380 | 46328.25 |
| Power L1 | 3222.02 | 3647.99 | 4546.97 | 9863.23 |
| Power MT | 210.47 | 205.85 | 195.60 | 405.50 |
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