Central Vermont 4-8-2 "Mountain" Locomotives of the USA

A Canadian National Mountain


Class Details by Steve Llanso of Sweat House Media

Class U-1-a (Locobase 7102)

Data from CV 1957 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. (Thanks to Chris Hohl for the link to the BrassTrains.com photo that pinned down the tender's coal capacity.) Works numbers were 67335-67338 in May 1927.

These Mountains were owned by the CV's parent Canadian National Railway and leased to the Vermont railroad. The firebox heating surface included a combustion chamber, 14 sq ft (1.3 sq m) (in two arch tubes, and 76 sq ft (7.05 sq m) in Nicholson thermic syphons. They also mounted Coffin feedwater heaters. Relatively small and light as North American 4-8-2s went, the U-1s were charged with moving The Montrealer over the CV's portion of the New York-Montreal express. Drury (1993) comments that they "were about the same size as the Florida East Coast 400 series ..." (See Locobase 1348). Indeed, a comparison of the specs shows them to have been virtually identical in every respect except for the CV engines having a higher boiler pressure.

Retirements came only in the late 1950s.

Specifications by Steve Llanso of Sweat House Media
ClassU-1-a
Locobase ID7102
RailroadCentral Vermont (CNR)
CountryUSA
Whyte4-8-2
Number in Class4
Road Numbers600-603
GaugeStd
Number Built4
BuilderAlco-Schenectady
Year1927
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)19.58
Engine Wheelbase (ft)42.08
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft)76.96
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)215,500
Engine Weight (lbs)326,100
Tender Loaded Weight (lbs)200,060
Total Engine and Tender Weight (lbs)526,160
Tender Water Capacity (gals)9550
Tender Fuel Capacity (oil/coal) (gals/tons)18
Minimum weight of rail (calculated) (lb/yd)90
Geometry Relating to Tractive Effort
Driver Diameter (in)73
Boiler Pressure (psi)210
High Pressure Cylinders (dia x stroke) (in)26" x 28"
Tractive Effort (lbs)46,283
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.66
Heating Ability
Firebox Area (sq ft)384
Grate Area (sq ft)66.80
Evaporative Heating Surface (sq ft)3856
Superheating Surface (sq ft)968
Combined Heating Surface (sq ft)4824
Evaporative Heating Surface/Cylinder Volume224.11
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14,028
Same as above plus superheater percentage16,834
Same as above but substitute firebox area for grate area96,768
Power L121,514
Power MT880.37

Photos

Reference


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