East Broad Top R & C 2-6-2 "Prairie" Type Locomotives

Described in a Railroad Age Gazette (21 August 1908) article covering three recent narrow-gauge engine deliveries, this pocket Prairie served both passenger and freight requirements on a Pennsylvania line that had curves of 17-deg radius. To gain the proper leverage, the main rod drove the rear set of drivers. RAG notes that "the boiler capacity is high in proportion to the tractive force" and concludes "... the design throughout is admirably adapted to the service required."

Specifications

Class

Locobase ID 4215

Railroad East Broad Top R & C

Whyte 2-6-2

Road Numbers

Gauge 3'

Builder Burnham, Williams & Co

Year 1908

Valve Gear Walschaert

Locomotive Length and Weight

Driver Wheelbase 9.50'

Engine Wheelbase 21.50'

Ratio of driving wheelbase to overall engine wheebase 0.44

Overall Wheelbase (engine & tender) 44.33'

Axle Loading (Maximum Weight per Axle)

Weight on Drivers 66180 lbs

Engine Weight 89780 lbs

Tender Light Weight 50220 lbs

Total Engine and Tender Weight 140000 lbs

Tender Water Capacity 2500 gals

Tender Fuel Capacity (oil/coal) 5 tons

Minimum weight per yard of rail on which locomotive could run 36.77 lb rail

Geometry Relating to Tractive Effort

Driver Diameter 48"

Boiler Pressure 160 psi

Cylinders (dia x stroke) 16" x 22"

Tractive Effort 15957 lbs

Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15

Heating Ability

Firebox Area 91.80 sq. ft

Grate Area 24 sq. ft

Evaporative Heating Surface 1159

Superheating Surface

Combined Heating Surface 1159

Evaporative Heating Surface/Cylinder Volume 226.38

Computations Relating to Power Output (More Information)

Robert LeMassena's Power Computation 3840

Same as above plus superheater percentage 3840

Same as above but substitute firebox area for grate area 14688

Power L1 4045.29

Power MT 404.28

Specifications
Class
Locobase ID	4215
Railroad	East Broad Top R & C
Whyte	2-6-2
Road Numbers
Gauge	3'
Builder	Burnham, Williams & Co
Year	1908
Valve Gear	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	9.50'
Engine Wheelbase	21.50'
Ratio of driving wheelbase to overall engine wheebase	0.44
Overall Wheelbase (engine & tender)	44.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	66180 lbs
Engine Weight	89780 lbs
Tender Light Weight	50220 lbs
Total Engine and Tender Weight	140000 lbs
Tender Water Capacity	2500 gals
Tender Fuel Capacity (oil/coal)	5 tons
Minimum weight per yard of rail on which locomotive could run	36.77 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	48"
Boiler Pressure	160 psi
Cylinders (dia x stroke)	16" x 22"
Tractive Effort	15957 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.15
	Heating Ability
Firebox Area	91.80 sq. ft
Grate Area	24 sq. ft
Evaporative Heating Surface	1159
Superheating Surface
Combined Heating Surface	1159
Evaporative Heating Surface/Cylinder Volume	226.38
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	3840
Same as above plus superheater percentage	3840
Same as above but substitute firebox area for grate area	14688
Power L1	4045.29
Power MT	404.28

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.