Western Maryland 2-10-0 "Decapod" Type Locomotives

Class I-1 (Locobase 4404)

857 2-10-0s were built by Baldwin and Alco (Richmond and Schenectady Works) for the Russian Government. When that empire was overthrown, some 200 more of the Russian order was diverted to railroads in the US by the USRA.

Ilustrations in Linn Wescott (Model Railroader Cyclopedia - Vol 1, 1960) and see Drury (1993), 176. Data confirmed and supplemented by WM MISC steam locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Note that the original adhesion weight for the Russians was given as 175,000 lb and axle loading weighed in at 34,000 lb. Perhaps when the WM adapted the running gear to run on standard gauge (it had been built for the Russian 5-foot gauge) and stretched the wheelbase by 2", they added a lot of steel to the frame ...Locobase is just guessing.

Class I-2 (Locobase 69)

Data from 1930 Locomotive Cyclopedia table, supplemented by WM MISC steam locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Virtually identical to L&NE engines (Locobase 65) delivered by the same builder at the same time. Locobase concludes that, like the L & NE 2-10-0s, the I-2 firebox had combustion chamber that measured 109 sq ft. As built, the hearth was rated at 360 sq ft of direct heating surface and total evaporative heating surface was measured at 4,431 sq ft. Boiler pressure was then set to 225 psi working pressure and raised to the specification figure later. The addition of thermic syphons meant deletion of the arch tubes, but the change increased the firebox heating surfact to the value shown in the specifications.

for being slightly heavier and fitted with much larger tenders. The latter were among the largest to be trailed behind a rigid-wheelbase locomotive.

Specifications
Class	I-1	I-2
Locobase ID	4404	69
Railroad	Western Maryland (WM)	Western Maryland (WM)
Whyte	2-10-0	2-10-0
Road Numbers	1101-1110	1111-1130
Gauge	Std	Std
Builder	several	Baldwin
Year	1918	1927
Valve Gear	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	18.67'	22.50'
Engine Wheelbase	27.83'	33.08'
Ratio of driving wheelbase to overall engine wheebase	0.67	0.68
Overall Wheelbase (engine & tender)	60.29'	92.79'
Axle Loading (Maximum Weight per Axle)	40700 lbs	78000 lbs
Weight on Drivers	195200 lbs	386800 lbs
Engine Weight	219000 lbs	419280 lbs
Tender Light Weight	155300 lbs	416180 lbs
Total Engine and Tender Weight	374300 lbs	835460 lbs
Tender Water Capacity	7400 gals	22000 gals
Tender Fuel Capacity (oil/coal)	17 tons	30 tons
Minimum weight per yard of rail on which locomotive could run	65 lb rail	129 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	52"	61"
Boiler Pressure	180 psi	240 psi
Cylinders (dia x stroke)	25" x 28"	30" x 32"
Tractive Effort	51490 lbs	96315 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.79	4.02
	Heating Ability
Firebox Area	227 sq. ft	503 sq. ft
Grate Area	64.70 sq. ft	104.50 sq. ft
Evaporative Heating Surface	2607	4574
Superheating Surface	579	1248
Combined Heating Surface	3186	5822
Evaporative Heating Surface/Cylinder Volume	163.88	174.71
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	11646	25080
Same as above plus superheater percentage	13975	30096
Same as above but substitute firebox area for grate area	49032	144864
Power L1	8780	17075
Power MT	495.81	486.61