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

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 type Steam Builder Canadian Locomotive Company Build date 1923–1924 Total produced 16 (U-1-a) 21 (U-1-b) Rebuild date 1947 (1) Number rebuilt 1 (No. 6001)
Specifications Configuration: ​  • Whyte 4-8-2  • UIC 2′D1′ h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 34+1⁄4 in (0.870 m) Driver dia. 73 in (1.854 m) Trailing dia. 43 in (1.092 m) Minimum curve 16° Wheelbase Loco: 41 ft 9 in (12.73 m) Length 90 ft 4+1⁄4 in (27.540 m) Width 10 ft 9+5⁄8 in (3.292 m) Adhesive weight 233,790–235,390 lb (106.05–106.77 tonnes) Loco weight 355,570–355,570 lb (161.28–161.28 tonnes) Total weight 602,600–603,870 lb (273.33–273.91 tonnes) Fuel type Coal or oil Fuel capacity Coal: 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 cap. 9,500–10,000 imp gal (43,000–45,000 L; 11,400–12,000 US gal) Firebox: ​  • Grate area 66.7 sq ft (6.20 m^2) Boiler pressure 210 lbf/in^2 (1.4 MPa) Heating surface: ​  • Firebox 319 sq ft (29.6 m^2)  • Tubes and flues 3,730 sq ft (347 m^2)  • Total surface 4,049 sq ft (376.2 m^2) Superheater: ​  • Type Schmidt  • Heating area 810–1,087 sq ft (75.3–101.0 m^2) Cylinders Two, outside Cylinder size 26 in × 30 in (0.66 m × 0.76 m) Valve gear Walschaerts Train heating Steam heat Loco brake Independent air Train brakes Automatic air
Performance figures Maximum speed 75–95 mph (121–153 km/h) Tractive effort 49,590 lbf (220.6 kN) Factor of adh. 4.71 – 4.74
Career Operators Canadian National Railways Power class 50% Number in class 16 (U-1-a) 21 (U-1-b) Numbers 6000–6015 (U-1-a) 6016-6036 (U-1-b) Retired 1950 (6004) 1951-1962 Preserved 6015 Disposition 6015 preserved remainder scrapped
References for above:[1]

[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

Year	Subclass	Quantity	Manufacturer	Serial nos.	CN Nos.	Notes
1923	U-1-a	16	Canadian Locomotive Company	1696–1711	6000–6015	6015 preserved in Jasper, Alberta, since 1972
1924	U-1-b	21	Canadian Locomotive Company	1744–1758, 1764–1769	6016–6036	All scrapped

Accidents and incidents

On 1 September 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 21 November 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 is 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:

• CN 6015 (U-1-a) — Retired 1960; to CHRA, Delson, Quebec. On public display in Jasper, Alberta, since July 1972.

References

1. "CNR U-1-a and U-1-b locomotive diagram". Canadian National Railways Historical Association. Archived from the original on 28 July 2011. Retrieved 13 June 2011.
2. Stephenson, Alan (2016). 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 13 June 2011.
5. http://www.1st-art-gallery.com/C.-Norwich/Canadian-National-Railways-Poster-1924.html Canadian National Railways Poster 1924