These engines were built in 3 batches:
5600-5607 by Baldwin in 1931 with Elesco feedwater heaters and Timken roller bearings,
5608-5620 by CB&Q using Baldwin boilers but Worthington SA feedwater heaters in 1937, and
5621-5635 by CB&Q in 1939.
Firebox heating surface included 45 sq ft of arch tubes and 83 sq ft of combustion chamber. All were fitted with Baker valve gear. The last batch (O-5A) had Boxpok disc drivers. Many of the earlier 4-8-4s were rebuilt to O-5A standard, which also included roller bearings, lightweight rods, vestibule cabs, and the solid pilot.
Some were later converted to oil-burning. All retired in the mid-1950s.
Corbin & Kerka (1960) quote a fireman about the O-5's power: "They steamed best under a wide-open throttle, and on a light train one had to keep the reverse down in the corner." They report on one train of 82 mail cars worked by a single O-5 on 17 October 1944.
| Specifications | |
|---|---|
| Class | O-5 |
| Locobase ID | 253 |
| Railroad | Chicago, Burlington & Quincy (CB&Q) |
| Whyte | 4-8-4 |
| Road Numbers | 5600-5635 |
| Gauge | Std |
| Builder | Several |
| Year | 1931 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 19.25' |
| Engine Wheelbase | 45.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.42 |
| Overall Wheelbase (engine & tender) | |
| Axle Loading (Maximum Weight per Axle) | 69340 lbs |
| Weight on Drivers | 274000 lbs |
| Engine Weight | 476050 lbs |
| Tender Light Weight | 350500 lbs |
| Total Engine and Tender Weight | 826550 lbs |
| Tender Water Capacity | 18000 gals |
| Tender Fuel Capacity (oil/coal) | 27 tons |
| Minimum weight per yard of rail on which locomotive could run | 114.17 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 74" |
| Boiler Pressure | 250 psi |
| Cylinders (dia x stroke) | 28" x 30" |
| Tractive Effort | 67541 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.06 |
| Heating Ability | |
| Firebox Area | 433 sq. ft |
| Grate Area | 106.50 sq. ft |
| Evaporative Heating Surface | 5225 |
| Superheating Surface | 2403 |
| Combined Heating Surface | 7628 |
| Evaporative Heating Surface/Cylinder Volume | 244.38 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 26625 |
| Same as above plus superheater percentage | 35012.50 |
| Same as above but substitute firebox area for grate area | 142351.30 |
| Power L1 | 41846.54 |
| Power MT | 1346.80 |
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