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Steam Locomotives of the Rock Island (CRIP)[Inhalt]
Chicago, Rock Island & Pacific (Rock Island) class P-40
United States | 1913
30 produced
No. 962 in July 1940 in Peoria, Illinois
No. 962 in July 1940 in Peoria, Illinois
collection Taylor Rush

After the P-33's 25 inch diameter cylinders were too large for the boiler, they had to be downsized to 23.5 inches. By increasing the grate area from 45 to 63 square feet, the P-40 class was born. They could now even enlarge the cylinders to 25.5 inches and still have enough steam. Like the P-33, it was oil fired.

A passenger train consisting of twelve cars and weighing 900 short tons was chosen to determine the pulling power. A one percent steep, six-mile incline was begun at 35 mph and averaged 27 mph without the boiler pressure dropping. In contrast to the previous locomotives, it was not necessary to subsequently install a booster or thermic siphons

In contrast to the P-33, the P-40 was not built by ALCO's Schenectady plant, but by ALCO-Brooks. With 30 locomotives, however, a smaller number was produced than with its predecessor. The first were retired in the late 1930s, the last in 1952.

General
Built1913
ManufacturerALCO
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase33 ft 10 in
Rigid wheelbase13 ft
Total wheelbase69 ft 5 1/2 in
Service weight281,500 lbs
Adhesive weight174,500 lbs
Total weight475,500 lbs
Axle load58,167 lbs
Water capacity8,500 us gal
Fuel capacity4,400 us gal (oil)
Boiler
Grate area63 sq ft
Firebox area238 sq ft
Tube heating area3,276 sq ft
Evaporative heating area3,514 sq ft
Superheater area805 sq ft
Total heating area4,319 sq ft
Power Plant
Driver diameter74 in
Boiler pressure190 psi
Expansion typesimple
Cylinderstwo, 25 1/2 x 28 in
Power
Power sourcesteam
Estimated power2,200 hp (1,641 kW)
Optimal speed35 mph
Starting effort39,736 lbf
Calculated Values
steam locomotive
last changed: 04/2023
Chicago, Rock Island & Pacific (Rock Island) class M-50
United States | 1913
82 produced
M-50a No. 4058 in June 1952 in Blue Island, Illinois
M-50a No. 4058 in June 1952 in Blue Island, Illinois
Arthur B. Johnson / collection Taylor Rush

One of the first railroads in the USA to purchase the 4-8-2 “Mountain” wheel arrangement was the Rock Island. In 1913, however, only the two prototypes of the M-50 class were initially delivered. They had square cylinder dimensions measuring 28 by 28 inches and drivers measuring 69 inches or 1,753 mm in diameter.

The First World War had to pass before series production came about. Between 1920 and 1924, 80 more M-50 were built in several batches, some of which were fired with coal and some with oil. They also had larger drivers of 74 inches or 1,880 mm, a larger firebox thanks to thermic syphons and a boiler pressure of 200 instead of 180 psi. Some of the coal-fired machines later received a stoker.

In 1941 seven were sold to the St. Louis Southwestern and rebuilt there. The Rock Island also rebuilt 18 of its locomotives to the M-50a. They got roller bearings on all axles, lighter connecting and coupling rods, disc drivers, a boiler pressure of 220 psi and two inch smaller cylinders that were cast in one piece along with the front frame.

Variantprototypesproductionrebuilt M-50a
General
Built19131920-19241941-1944
ManufacturerALCOSilvis
Axle config4-8-2 (Mountain) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase38 ft 11 in42 ft 3 in42 ft 1 in
Rigid wheelbase18 ft19 ft 10 in
Total wheelbase70 ft 2 1/2 in88 ft 4 in87 ft 10 in
Service weight333,000 lbs378,000 lbs378,500 lbs
Adhesive weight224,000 lbs255,250 lbs253,500 lbs
Total weight493,500 lbs572,000 lbs722,000 lbs
Axle load56,000 lbs63,813 lbs63,375 lbs
Water capacity8,500 us gal10,000 us gal20,000 us gal
Fuel capacity28,000 lbs (coal)32,000 lbs (coal)5,000 us gal (oil)
Boiler
Grate area62.7 sq ft63 sq ft
Firebox area312 sq ft397 sq ft368 sq ft
Tube heating area3,805 sq ft4,288 sq ft4,069 sq ft
Evaporative heating area4,117 sq ft4,685 sq ft4,437 sq ft
Superheater area944 sq ft1,196 sq ft1,276 sq ft
Total heating area5,061 sq ft5,881 sq ft5,713 sq ft
Variantprototypesproductionrebuilt M-50a
Power Plant
Driver diameter69 in74 in
Boiler pressure180 psi200 psi220 psi
Expansion typesimple
Cylinderstwo, 28 x 28 intwo, 26 x 28 in
Power
Power sourcesteam
Estimated power2,800 hp (2,088 kW)3,300 hp (2,461 kW)3,500 hp (2,610 kW)
Optimal speed37 mph42 mph47 mph
Starting effort48,676 lbf50,430 lbf47,832 lbf
Calculated Values
steam locomotive
freight
passenger
last changed: 01/2024
Chicago, Rock Island & Pacific (Rock Island) classes R-65 and R-67
United States | 1929
85 produced
R-67b No. 5043 in October 1940 at Kansas City
R-67b No. 5043 in October 1940 at Kansas City
collection Taylor Rush

The first 65 class R-65 Northerns of the Rock Island were delivered by ALCO-Schenectady in 1929 and 1930. They had a driver diameter of 69 inches and were primarily intended for service with freight trains. Some later received 74 inch wheels to be more suitable for passenger trains and were renamed the R-67 class as a result. In the years 1944 and 1946 further R-67b were built, which had larger wheels from the start. Although they had a higher boiler pressure and a larger firebox, they had a smaller tube heating area and a significantly smaller superheater. The 1944 batch were oil fired while the rest were coal fired.

VariantR-65R-67
General
Built1929-19301944, 1946
ManufacturerALCO
Axle config4-8-4 (Northern) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase45 ft 7 in47 ft 1 in
Rigid wheelbase19 ft 3 in19 ft 9 in
Total wheelbase88 ft95 ft 11 in
Service weight434,000 lbs467,000 lbs
Adhesive weight265,500 lbs280,000 lbs
Total weight738,300 lbs837,500 lbs
Axle load66,375 lbs70,000 lbs
Water capacity15,000 us gal21,500 us gal
Fuel capacity40,000 lbs (coal)5,500 us gal (oil)
Boiler
Grate area88.3 sq ft96.3 sq ft
Firebox area505 sq ft578 sq ft
Tube heating area4,938 sq ft3,995 sq ft
Evaporative heating area5,443 sq ft4,573 sq ft
Superheater area2,243 sq ft1,438 sq ft
Total heating area7,686 sq ft6,011 sq ft
VariantR-65R-67
Power Plant
Driver diameter69 in74 in
Boiler pressure250 psi270 psi
Expansion typesimple
Cylinderstwo, 26 x 32 in
Power
Power sourcesteam
Estimated power4,400 hp (3,281 kW)4,800 hp (3,579 kW)
Optimal speed42 mph46 mph
Starting effort66,620 lbf67,088 lbf
Calculated Values
steam locomotive
freight
passenger
last changed: 07/2023
Chicago, Rock Island & Pacific (Rock Island) class C-43
United States | 1906
158 produced
No. 2049 in April 1938 at Minneapolis
No. 2049 in April 1938 at Minneapolis
R.H. Carlson / collection Richard Driver

The class C-43 of the Rock Island didn't technically designate a series of similar locomotives, but only stood for Consolidations with a tractive effort of around 43,000 pounds. 83 locomotives with the numbers 1701 to 1783 were built by Baldwin in 1906. With drivers of 63 inches and cylinders of 23 by 30 inches, they initially only produced a tractive effort of 39,600 pounds. Only after they got larger cylinders when being superheated starting in 1918, they produced 43,100 pounds. ALCO-Brooks built numbers 1901 to 1930 in 1907 which were similar to the first batch.

Also in 1907, ALCO-Schenectady built numbers 2100 to 2144 which had drivers of only 57 inches and a higher boiler pressure and produced 43,300 pounds even with cylinders of only 22 by 30 inches. They had a firebox that was somewhat larger than that of the earlier Consolidations, but with roughly the same grate area. Most were later superheated and were fitted with thermic syphons which increased the grate area from 183 to 240 square feet. Like the earlier Consolidations, they were retired between 1936 and 1953.

Variant1701-17832100-2144superheated
General
Built19061907from 1916
ManufacturerBaldwinALCORock Island
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase26 ft24 ft 9 in
Rigid wheelbase17 ft16 ft
Total wheelbase58 ft58 ft 7 1/2 in
Service weight198,600 lbs206,000 lbs210,700 lbs
Adhesive weight177,300 lbs183,000 lbs187,000 lbs
Total weight338,000 lbs355,700 lbs360,400 lbs
Axle load44,325 lbs51,500 lbs52,675 lbs
Water capacity7,000 us gal7,500 us gal
Fuel capacity24,000 lbs (coal)28,000 lbs (coal)
Boiler
Grate area49.7 sq ft50 sq ft
Firebox area169 sq ft183 sq ft240 sq ft
Tube heating area2,754 sq ft2,654 sq ft2,301 sq ft
Evaporative heating area2,923 sq ft2,894 sq ft2,541 sq ft
Superheater area510 sq ft
Total heating area2,923 sq ft2,894 sq ft3,051 sq ft
Variant1701-17832100-2144superheated
Power Plant
Driver diameter63 in57 in
Boiler pressure185 psi200 psi190 psi
Expansion typesimple
Cylinderstwo, 23 x 30 intwo, 22 x 30 intwo, 22 1/2 x 30 in
Power
Power sourcesteam
Estimated power1,500 hp (1,119 kW)1,650 hp (1,230 kW)1,900 hp (1,417 kW)
Optimal speed24 mph28 mph
Starting effort39,612 lbf43,305 lbf43,031 lbf
Calculated Values
steam locomotive
freight
last changed: 08/2024
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