Spokane, Portland & Seattle 4-8-4 "Northern" Locomotives in the USA

The Spokane, Portland & Seattle Railway was owned jointly by the Northern Pacific and the Great Northern and was never permitted to build steam locomotives of its own design. Instead, it received most of its motive power used, as hand-me-downs, from its parents. On rare occasions, locomotives arrived new from add-ons to NP or GN orders. This happened in 1938 when three NP class A-3 Northerns were deliverd from the Baldwin Locomotive Works. On the SP&S these three were given Class E-1 designation and road numbers 700 through 702. The only difference was that on the SP&S they were oil burners.

Number 700 survives today, in operating condition, and is located at SP Brooklyn roundhouse, Portland, OR.

Class Details by Steve Llanso of Sweat House Media

Class E-1 (Locobase 1068)

Data from SP&S 2 - 1953 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers ran 62171-62173 in May 1938.

Said to have been identical to the Northern Pacific's A-3s (Locobase 932), which they immediately followed on Baldwin's production line. They had Worthington feedwater heaters, Timken roller bearings, 14" (356 mm) piston valves with 8" (203 mm) travel. The one difference was the firebox, which on the SP&S engines burned Bunker C oil fuel.

These endured until 1960 when they were retired. 701-702 were sold for scrap along with all of the railroad's 4-6-6-4s to Oregon Steel Mills on 26 May 1960.. #700, donated tot he city of Portland on 13 January 1958, later resumed operation as an excursion engine.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID1068
RailroadSpokane, Portland & Seattle
Number in Class3
Road Numbers700-702
Number Built3
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)20.66 / 6.30
Engine Wheelbase (ft / m)48.58 / 14.81
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender) (ft / m)110.56 / 33.70
Axle Loading (Maximum Weight per Axle) (lbs / kg)77,200 / 35,017
Weight on Drivers (lbs / kg)294,500 / 133,583
Engine Weight (lbs / kg)485,820 / 220,365
Tender Loaded Weight (lbs / kg)379,700 / 172,229
Total Engine and Tender Weight (lbs / kg)865,520 / 392,594
Tender Water Capacity (gals / ML)20,000 / 75.76
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8800 / 33.30
Minimum weight of rail (calculated) (lb/yd / kg/m)123 / 61.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)77 / 1956
Boiler Pressure (psi / kPa)260 / 17.90
High Pressure Cylinders (dia x stroke) (in / mm)28" x 31" / 711x787
Tractive Effort (lbs / kg)69,756 / 31640.83
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22
Heating Ability
Firebox Area (sq ft / m2)490 / 45.54
Grate Area (sq ft / m2)115 / 10.69
Evaporative Heating Surface (sq ft / m2)4703 / 437.08
Superheating Surface (sq ft / m2)2036 / 189.22
Combined Heating Surface (sq ft / m2)6739 / 626.30
Evaporative Heating Surface/Cylinder Volume212.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29,900
Same as above plus superheater percentage38,870
Same as above but substitute firebox area for grate area165,620
Power L138,478
Power MT1152.18

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