Had slightly more tractive effort than the L-2s, which were USRA designs; the L-1s were ordered on 31 March 1917, but were put in production two years later. The class was delivered with a tender weighing 180,000 lb (81,647 kg) that held 10,000 US gallons (37,850 litres) of water and 15 tons (13.6 tonnes) of coal.
Included in the direct heating surface area was the 132 sq ft (12.25 sq m) of combustion chamber and the 45 sq ft (4.2 sq m) of the five arch tubes. Even with a 5 1/2-foot long combustion chamber, the boiler still contained 24-foot long tubes and flues. Even so, the L-1 had to be a slow-speed engine because its boiler needed to fill its large HP cylinder volume.
One unusual feature was the different diameters of piston valves for the two different cylinder volumes served. HP cylinders had 15" (381 mm) piston valves while the LPs used 17" (432 mm) piston valves.
Operated until 1948-1950.
Standard USRA design based on N&W Y-2 Mallet compound locomotive and delivered to the Clinchfield in 1919. Unlike the light articulateds, the "heavy" was considered a great success. These had 14" (356 mm) piston valves on all cylinders.
Ten more entered service in 1923 as L-3 (Locobase 1321). This class operated until 1950-1952.
Follow-ups to the earlier 10 built to the USRA heavy articulated design (Locobase 1320). These were essentially similar, but came from Brooks rather than Baldwin. Operated until 1951-1952.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Carolina, Clinchfield & Ohio (Clinchfield)||Carolina, Clinchfield & Ohio (Clinchfield)||Carolina, Clinchfield & Ohio (Clinchfield)|
|Number in Class||7||10||10|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||18.50||15.50||15.50|
|Engine Wheelbase (ft)||57.33||57.33||57.33|
|Ratio of driving wheelbase to overall engine wheebase||0.32||0.27||0.27|
|Overall Wheelbase (engine & tender) (ft)||95.92||93.25||93.25|
|Axle Loading (Maximum Weight per Axle) (lbs)||60,000||60,700||62,000|
|Weight on Drivers (lbs)||467,000||478,000||486,500|
|Engine Weight (lbs)||523,600||531,000||541,000|
|Tender Loaded Weight (lbs)||314,000||214,000||209,000|
|Total Engine and Tender Weight (lbs)||837,600||745,000||750,000|
|Tender Water Capacity (gals)||12,000||12,000||12,000|
|Tender Fuel Capacity (oil/coal) (gals/tons)||23||16||16|
|Minimum weight of rail (calculated) (lb/yd)||97||100||101|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||57||57||57|
|Boiler Pressure (psi)||200||240||240|
|High Pressure Cylinders (dia x stroke) (in)||28" x 32"||25" x 32"||25" x 32"|
|Low Pressure Cylinders (dia x stroke) (in)||42" x 32"||39" x 32"||39" x 32"|
|Tractive Effort (lbs)||103,602||101,465||101,465|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.51||4.71||4.79|
|Firebox Area (sq ft)||438||435||435|
|Grate Area (sq ft)||96.20||96||96|
|Evaporative Heating Surface (sq ft)||6123||6120||6120|
|Superheating Surface (sq ft)||1595||1475||1475|
|Combined Heating Surface (sq ft)||7718||7595||7595|
|Evaporative Heating Surface/Cylinder Volume||268.49||336.62||336.62|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||19,240||23,040||23,040|
|Same as above plus superheater percentage||23,280||27,418||27,418|
|Same as above but substitute firebox area for grate area||105,996||124,236||124,236|