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 (#6001)
Specifications
Configuration:
​
 • Whyte4-8-2
 • UIC2′D1′ h2
Gauge4 ft 8 1⁄2 in (1,435 mm)
Leading dia.34 1⁄4 in (0.870 m)
Driver dia.73 in (1.854 m)
Trailing dia.43 in (1.092 m)
Minimum curve16°
WheelbaseLoco: 41 ft 9 in (12.73 m)
Length90 ft 4 1⁄4 in (27.54 m)
Width10 ft 9 5⁄8 in (3.29 m)
Adhesive weight233,790–235,390 lb (106.0–106.8 tonnes)
Loco weight355,570–355,570 lb (161.3–161.3 tonnes)
Total weight602,600–603,870 lb (273.3–273.9 tonnes)
Fuel typeCoal or Oil
Fuel capacityCoal: 17–20 long tons (20–20 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 (43,200–45,500 l; 11,400–12,000 US gal)
Firebox:
 • Firegrate area		66.7 sq ft (6.20 m2)
Boiler pressure210 lbf/in2 (1.45 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
Tractive effort49,590 lbf (220.59 kN)
Factor of adh.4.71 – 4.74
Career
OperatorsCanadian National Railways
Power class50%
Number in class42
Numbers6000–6015 (U-1-a) 6016-6036 (U-1-b)
Retired1950 (6004) 1951-1962
Preserved6015
Disposition6015 preserved remainder scrapped
References for above:[1]

Accident’s and incidents

On September 1st 1947 locomotive 6001 was involved in the Dugald Train Disaster Train Disaster it collided with another CN 4-8-2 numbered 6046 both locomotives collided #6001 was later rebuilt by CN a day after the wreck .

On November 21st 1950 6004, which was severely damaged a head-on collision with S-2-a 2-8-2 3538 at Canoe River, British Columbia, in November 1950. 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:

gollark: And yet they don't have usable keybords for writing things, sufficiently large screens to do video editing and such without æ, OSes which are designed to allow data sharing between apps for purposes, a sufficiently non-locked-down system for basically any sort of scripting/programming outside of somewhat isolated environments, etc.
gollark: I only do it in emergencies or when heavpoot asks for OIR:EM or something because it's quite irritating.
gollark: Phones are not designed for content creation.
gollark: The solution is of course to replace my calculator's innards with some sort of high end microcontroller with a 2G modem, relabel the buttons, and install SSH on it.
gollark: Or, well, the connection is okay, mosh can compensate for latency, but æ the bad phone IO.

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.
  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, ISBN 978-90-481-8447-7, retrieved 2020-07-27
  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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