These logging Mikados burned oil, so they used straight stacks. The superheater dictated the use of piston valves (8"/203 mm diameter). Steep 5% grades prompted a note that the fire box crown was to be arranged for such inclinations.
Only the 4 was delivered with an adhesion weight of 114,000 lb (51,710 kg). All of the others put more weight on the drivers, but 4,800 pounds less (2,177 kg) on the rear truck under the firebox. The difference seems to have originated in an increased amount of water in the boiler. The 4's tender carried the same amount of fuel and water as the later engines, but somehow came in 18,000 lb (8,165 kg) lighter at 70,000 lb (31,752 kg).
A sister to the 6 was sold to the parent's British Columbia operation as their #2; see Locobase 14692.
Georgia-Pacific acquired the 5 in 1956. After its retirement, the engine went on display at Corvallis, Ore. , 7, later renumbered 8, went to the Valley & Siletz as their #56 in 1939.
The #9 later moved to B-S's operations in Foley, Florida. It was then sold to the Albany & Northern in Georgia. After its retirement, the 9 went on display in Camilla, Georgia. It is marked for the Southern and is saluted as the "Spirit of Camilla" on the roof of its display.
|Specifications by Steve Llanso of Sweat House Media|
|Number in Class||5|
|Road Numbers||4-7, 9|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||12 / 3.66|
|Engine Wheelbase (ft / m)||27.58 / 8.41|
|Ratio of driving wheelbase to overall engine wheebase||0.44|
|Overall Wheelbase (engine & tender) (ft / m)||50.17 / 15.29|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||118,100 / 53,569|
|Engine Weight (lbs / kg)||144,000 / 65,317|
|Tender Loaded Weight (lbs / kg)||88,000 / 39,916|
|Total Engine and Tender Weight (lbs / kg)||232,000 / 105,233|
|Tender Water Capacity (gals / ML)||4000 / 15.15|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||2000 / 7.60|
|Minimum weight of rail (calculated) (lb/yd)||49|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||44 / 1118|
|Boiler Pressure (psi / kPa)||190 / 13.10|
|High Pressure Cylinders (dia x stroke) (in / mm)||18" x 24" / 457x610|
|Tractive Effort (lbs / kg)||28,541 / 12946.00|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.14|
|Firebox Area (sq ft / m2)||141 / 13.10|
|Grate Area (sq ft / m2)||25.50 / 2.37|
|Evaporative Heating Surface (sq ft / m2)||1576 / 146.41|
|Superheating Surface (sq ft / m2)||328 / 30.47|
|Combined Heating Surface (sq ft / m2)||1904 / 176.88|
|Evaporative Heating Surface/Cylinder Volume||222.96|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4845|
|Same as above plus superheater percentage||5669|
|Same as above but substitute firebox area for grate area||31,344|