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Chicago & North Western class R-1
United States | 1901 | 325 produced
No. 1429 in August 1954 in Ashland, Wisconsin
No. 1429 in August 1954 in Ashland, Wisconsin
collection Greg Maxwell

In order to increase the power of the ten-wheelers for freight train use, the R-1 was developed on the basis of the R class. The biggest limitation of the R was the firebox, which was located between the frames and could not be enlarged any further.

Therefore, the R-1 received a shallower but wider firebox that stood on the frame. This allowed their width to be increased from 40 to 64 inches. Its walls were corrugated to reduce expansion cracks and increase maintenance intervals. Other changes included increasing the cylinder diameter from 20 to 21 inches, a boiler pressure of 200 instead of 190 psi, and piston instead of slide valves.

No. 444 in the year 2012
No. 444 in the year 2012
Andrew Filer

Between 1901 and 1908 240 locomotives were built by ALCO in Schenectady and 85 by Baldwin. In the beginning, all locomotives had an inside Stephenson valve gear, but in the final series from 1907, an outside Heusinger valve gear was used.

At least 87 locomotives were later fitted with oil firing. 299 units were superheated around 1926. The heating surface of the firebox was once again significantly enlarged by installing arch pipes and thermosiphons

As more powerful locomotives became available, the R-1 was progressively pushed out of main line freight service on branch lines. The first larger numbers were phased out from 1939 and by 1957 the last one had disappeared. Three pieces are still preserved today, two of which are being restored.

Variantas builtsuperheated
General
Built1901-19081926
ManufacturerALCO, BaldwinChicago & North Western
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase25 ft 10 in
Fixed wheelbase14 ft 10 in
Total wheelbase57 ft 9 in
Service weight179,500 lbs186,000 lbs
Adhesive weight135,500 lbs139,000 lbs
Total weight319,000 lbs330,000 lbs
Water capacity7,500 us gal
Fuel capacity20,000 lbs (coal)
Power
Power sourcesteam
Estimated power1,500 hp (1,119 kW)1,550 hp (1,156 kW)
Optimal speed31 mph32 mph
Starting effort30,940 lbf
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 21 x 26 in
Boiler
Grate area46.3 sq ft47.2 sq ft
Firebox area150.8 sq ft216.7 sq ft
Tube heating area2,808.2 sq ft1,746.3 sq ft
Evaporative heating area2,959 sq ft1,963 sq ft
Superheater area476 sq ft
Total heating area2,959 sq ft2,439 sq ft
Calculated Values
steam locomotive
freight
last changed: 01/2023
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