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|
Schenectady delivered the first two batches in 1929, the third in 1930. Works numbers were 67670 inFebruary 1929, 68003-68004 in July, 68005-68020 in August, 68021-68023 in September, 68024-68026 in October, 68288-68291 in March 1930, 68292-68326 in April, 68327 in May.
Firebox had 150 sq ft (13.9 sq m) of thermic syphons, Coffin feedwater heaters, and Chambers front end throttle. All of the class received 74" drivers by 1944, which led to their class ID changing to R-67. 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.
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 fifteen years after the earlier R-67-B group, had much less superheating area and older ratio of tubes to flues. 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. Another possibility is that reported difficulties in maintaining Type E superheaters may have prompted the change.
In fact, the class strongly resembles 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.
|Specifications by Steve Llanso of Sweat House Media|
|Class||R-65A, B, C/R-67||R-67|
|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)||88'||95.92'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||265500 lbs||280000 lbs|
|Engine Weight||434000 lbs||467000 lbs|
|Tender Light Weight||304300 lbs||370500 lbs|
|Total Engine and Tender Weight||738300 lbs||837500 lbs|
|Tender Water Capacity||15000 gals||21500 gals|
|Tender Fuel Capacity (oil/coal)||20 tons||5500 gals|
|Minimum weight of rail (calculated)||111 lb/yard||117 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||250 psi||270 psi|
|Cylinders (dia x stroke)||26" x 32"||26" x 32"|
|Tractive Effort||66620 lbs||67088 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.99||4.17|
|Firebox Area||505 sq. ft||578 sq. ft|
|Grate Area||88.30 sq. ft||96.30 sq. ft|
|Evaporative Heating Surface||5443 sq. ft||4573 sq. ft|
|Superheating Surface||2243 sq. ft||1438 sq. ft|
|Combined Heating Surface||7686 sq. ft||6011 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||276.80||232.56|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22075||26001|
|Same as above plus superheater percentage||28477||32241|
|Same as above but substitute firebox area for grate area||162863||193514|