Spokane, Portland & Seattle 4-8-4 "Northern" Type Locomotives

Introduction

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

Class E-1 (Locobase 1068)

Data from SP&S 2 - 1953 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. 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.


Specifications by Steve Llanso
ClassE-1
Locobase ID1068
RailroadSpokane, Portland & Seattle
CountryUSA
Whyte4-8-4
Road Numbers700-702
GaugeStd
BuilderBaldwin
Year1938
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase20.66'
Engine Wheelbase48.58'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)110.56'
Axle Loading (Maximum Weight per Axle)77200 lbs
Weight on Drivers294500 lbs
Engine Weight485820 lbs
Tender Light Weight379700 lbs
Total Engine and Tender Weight865520 lbs
Tender Water Capacity20000 gals
Tender Fuel Capacity (oil/coal)8800 gals
Minimum weight of rail (calculated) on which locomotive could run123 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter77"
Boiler Pressure260 psi
Cylinders (dia x stroke)28" x 31"
Tractive Effort69756 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22
Heating Ability
Firebox Area490 sq. ft
Grate Area115 sq. ft
Evaporative Heating Surface4703 sq. ft
Superheating Surface2036 sq. ft
Combined Heating Surface6739 sq. ft
Evaporative Heating Surface/Cylinder Volume212.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29900
Same as above plus superheater percentage38870
Same as above but substitute firebox area for grate area165620
Power L138478
Power MT1152.18

Photos

Reference

Credits

Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.