CN U-1-a and U-1-b

[2][3]The Canadian National U-1-a U-1-b class locomotives were three subclasses of 37 4-8-2 Mountain-type steam locomotives built for the Canadian National Railways between 1923 and 1924 . They were retired between 1951 and 1962 .

Table of Orders and numbers
YearSubclassQuantityManufacturerSerial nos.CN Nos.Notes
1923U-1-a16Canadian Locomotive Company1696–17116000–60156015 preserved in Jasper, Alberta, since 1972
1924U-1-b21Canadian Locomotive Company1744–1758, 1764–17696016–6036All Scrapped
Canadian National U-1-a and U-1-b
CN U-1-a locomotive 6015; On public display at Jasper, Alberta, since July 1972
Type and origin
Power typeSteam
BuilderCanadian Locomotive Company
Build date1923–1924
Total produced16 (U-1-a) 21 (U-1-b)
Rebuild date1947 (1)
Number rebuilt1 (No. 6001)
Specifications
Configuration:
​
 • Whyte4-8-2
 • UIC2′D1′ h2
Gauge4 ft 8 1⁄2 in (1,435 mm)
Leading dia.34 1⁄4 in (0.87 m)
Driver dia.73 in (1.9 m)
Trailing dia.43 in (1.1 m)
Minimum curve16°
WheelbaseLoco: 41 ft 9 in (12.73 m)
Length90 ft 4 1⁄4 in (27.540 m)
Width10 ft 9 5⁄8 in (3.292 m)
Adhesive weight233,790–235,390 lb (106.05–106.77 tonnes)
Loco weight355,570–355,570 lb (161.28–161.28 tonnes)
Total weight602,600–603,870 lb (273.33–273.91 tonnes)
Fuel typeCoal or oil
Fuel capacityCoal: 17–20 long tons (17–20 t)
Oil: 4,000–5,000 imp gal (18,200–22,700 l; 4,800–6,000 US gal)
Water cap9,500–10,000 imp gal (43,000–45,000 l; 11,400–12,000 US gal)
Firebox:
 • Firegrate area		66.7 sq ft (6.20 m2)
Boiler pressure210 lbf/in2 (1.4 MPa)
Heating surface4,049 sq ft (376.2 m2)
 • Tubes and flues3,730 sq ft (347 m2)
 • Firebox319 sq ft (29.6 m2)
Superheater:
​
 • TypeSchmidt
 • Heating area810–1,087 sq ft (75.3–101.0 m2)
CylindersTwo, outside
Cylinder size26 in × 30 in (0.66 m × 0.76 m)
Valve gearWalschaerts
Train heatingSteam heat
Loco brakeIndependent air
Train brakesAutomatic air
Performance figures
Maximum speed75–95 mph (121–153 km/h)
Tractive effort49,590 lbf (220.6 kN)
Factor of adh.4.71 – 4.74
Career
OperatorsCanadian National Railways
Power class50%
Number in class16 (U-1-a) 21 (U-1-b)
Numbers6000–6015 (U-1-a) 6016-6036 (U-1-b)
Retired1950 (6004) 1951-1962
Preserved6015
Disposition6015 preserved remainder scrapped
References for above:[1]

Accidents and incidents

On September 1, 1947, locomotive 6001 was involved in the Dugald rail accident. It collided with another CN 4-8-2 numbered 6046. No. 6001 was later rebuilt by CN.

On November 21, 1950, locomotive 6004, was severely damaged a head-on collision with S-2-a 2-8-2 No. 3538 at Canoe River, British Columbia. It was scrapped in June 1951 (as was the 3538). There was a gap of four years before the next U-1-a or U-1-b went: two were scrapped in 1955, four in 1957, six in 1958, six in 1959, eight in 1960, seven in 1961, and the last two, 6000 and 6001 in 1962.[4]

In art

U-1-a 6004 was the subject of a 1924 publicity poster by C. Norwich. It depicts the locomotive speeding along in the foreground, while in the background is a pine-covered, snow-capped mountain peak. Across the top is the "Canadian National Railways" logotype; across the bottom are the words, "Across Canada", and in the lower left, above the artist name and date is "The Continental Limited in the Canadian Rockies"[5]

Preservation

One locomotive has been preserved:

References
  1. "CNR U-1-a and U-1-b locomotive diagram". Canadian National Railways Historical Association. Archived from the original on 2011-07-28. Retrieved 2011-06-13.
  2. Stephenson, Alan. Canadian National Security Culture: Explaining Post 9/11 Canadian National Security Policy Outcomes (Thesis). Carleton University. doi:10.22215/etd/2016-11459.
  3. Bicknell-Johnson, Marjorie; Bergum, Gerald E. (1988), "The Generalized Fibonacci Numbers {Cn}, Cn = Cn-1 + Cn-2 + K", Applications of Fibonacci Numbers, Dordrecht: Springer Netherlands, pp. 193–205, doi:10.1007/978-94-015-7801-1_18, ISBN 978-90-481-8447-7
  4. "Canadian National Railways Steam Locomotive Roster, Mountain Type". Retrieved 2011-06-13.
  5. http://www.1st-art-gallery.com/C.-Norwich/Canadian-National-Railways-Poster-1924.html Canadian National Railways Poster 1924
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