These 65 locomotives had 69" drivers, 26 x 32 cylinders, a boiler pressure of 250 psi, weighed about 437,000 lbs and had a tractive effort of 66,620 pounds. Although designed for freight trains they were also used in passenger service and some were rebuilt with 73" drivers to provide more speed when used on passenger trains.
In 1944, CRI&P took delivery of ten more Northerns (road numbers 5100 through 5109) and in 1946, ten more (road numbers 5110 through 5119). All twenty of these Class R67-b Northerns came from ALCO. The first ten were oil burners and the last ten were delivered as coal burners. These 20 locomotives had 74" drivers, 26 x 32 cylinders, a boiler pressure of 270 psi, a weight of 474,500 lbs and a tractive effort of 67,088 pounds.
The CRI&P had the largest fleet (85) of these locomotives in the United States and was second to the Canadian National Railroad in North America and third to the USSR in the world. No CRI&P Northerns were saved.
|Class||Road Numbers||Year Built||Builder|
Firebox had four thermic syphons that totalled 155 sq ft (14.4 sq m). Piston valves measured a relatively small 12" (306 mm) in diameter.
Note that these twenty locomotives, built 15 years after the earlier R-67-B group, had much less superheating area and outdated tube and flue arrangement. Cylinder volume and driver diameter remained the same, but boiler pressure increased by 20 psi (1.38 bar). Wartime restrictions on high-temperature alloys probably had something to do with that retrograde. In fact, they strongly resemble the Delaware & Hudson K-62s built at the same time by the same builder. Among more modern features these engines showed were roller bearings on all axles and Boxpok drivers.
The first ten engines were oil-fired, the last ten burned coal. The tenders for each group held the same amount of water, but the latter group's tenders carried 22 tons (20 metric tons) of coal.
Firebox had 150 sq ft (13.9 sq m) of thermic syphons, Coffin feedwater heaters, and Chambers front end throttle. The 1952 diagrams indicate that locomotives fitted with an auxiliary booster engine on the trailing truck were designated R-67-B, those without were simply R-67.
According to Drury (1993), this design's size and weight limited their operation to the Chicago-Des Moines corridor, the Chicago-Dalhart, Texas line, and the segment between Herington, Kan and El Reno, Okla. Later bridge-strengthening allowed these heavyweights to pull freights and passenger trains to Denver, Fort Worth, Tucumcari, and Minneapolis. Ten of this large stud of Northerns (the largest on a North American road) received a larger tender, roller bearings, and thicker driver tires.
|Specifications by Steve Llanso|
|Railroad||Rock Island (CRI & P)||Rock Island (CRI & P)|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.42||0.42|
|Overall Wheelbase (engine & tender)||95.92'||88'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||280000 lbs||265500 lbs|
|Engine Weight||467000 lbs||434000 lbs|
|Tender Light Weight||370500 lbs||304300 lbs|
|Total Engine and Tender Weight||837500 lbs||738300 lbs|
|Tender Water Capacity||21500 gals||15000 gals|
|Tender Fuel Capacity (oil/coal)||5500 gals||20 tons|
|Minimum weight of rail (calculated) on which locomotive could run||117 lb/yard||111 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||270 psi||250 psi|
|Cylinders (dia x stroke)||26" x 32"||26" x 32"|
|Tractive Effort||67088 lbs||66620 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17||3.99|
|Firebox Area||578 sq. ft||515 sq. ft|
|Grate Area||96.30 sq. ft||88.30 sq. ft|
|Evaporative Heating Surface||4573 sq. ft||5443 sq. ft|
|Superheating Surface||1438 sq. ft||2243 sq. ft|
|Combined Heating Surface||6011 sq. ft||7686 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||232.56||276.80|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||26001||22075|
|Same as above plus superheater percentage||32241||28477|
|Same as above but substitute firebox area for grate area||193514||166088|