New Orleans Great Northern / Gulf, Mobile & Northern 2-10-0 "Decapod" Type Locomotives

Class 201 (Locobase 4403)

857 2-10-0s were built by Baldwin and Alco (Richmond and Schenectady Works) for the Russian Government (see Locobase 381 for a full description). When that empire was overthrown, some 200 more of the Russian order was diverted to railroads in the US by the USRA. Of the 10 that went to the GM&N, two were later transferred to the Alabama, Tennessee & Northern.

Ilustrations in Linn Wescott (Model Railroader Cyclopedia - Vol 1, 1960) and see Drury (1993), 176.

Class 250 (Locobase 1399)

16 engines of Baldwin's standard catalog light 2-10-0 developed in the 1920s to put engines with this tractive effort on relatively light rails. Their relatively high drivers let them run faster than other Decapod designs.

Some were retrofitted with a Coffin feedwater heater that wrapped like a horse collar around the firebox, bigger air pumps, and a second sand dome.

Class 90 (Locobase 6907)

As noted in several other Locobase entries, 857 2-10-0s were built by Baldwin and Alco (Richmond and Schenectady Works) for the Russian Government (see Locobase 381 for a full description). When that empire was overthrown, some 200 more of the Russian order was diverted to railroads in the US by the USRA.

The NOGN received its three Decapods in April 1921. As with the other roads that ran them, the NOGN apparently liked the relatively light-footed axle loadings.

Specifications
Class	201	250	90
Locobase ID	4403	1399	6907
Railroad	Gulf, Mobile & Northern (GM&O)	Gulf, Mobile & Northern (GM&O)	New Orleans Great Northern (GM&O)
Whyte	2-10-0	2-10-0	2-10-0
Road Numbers	201-210	250-265	90-92
Gauge	Std	Std	Std
Builder	several	Baldwin	several
Year	1918	1923	1918
Valve Gear	Walschaert	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	18.33'	20'	18.33'
Engine Wheelbase	27.54'	28.90'	27.83'
Ratio of driving wheelbase to overall engine wheebase	0.67	0.69	0.66
Overall Wheelbase (engine & tender)	60'	65.14'
Axle Loading (Maximum Weight per Axle)	35000 lbs	46000 lbs	35260 lbs
Weight on Drivers	175000 lbs	227060 lbs	176000 lbs
Engine Weight	197900 lbs	253730 lbs	202000 lbs
Tender Light Weight	152200 lbs	165690 lbs	142800 lbs
Total Engine and Tender Weight	350100 lbs	419420 lbs	344800 lbs
Tender Water Capacity	7400 gals	8500 gals	7400 gals
Tender Fuel Capacity (oil/coal)	8.8 tons	3500 gals	14.2 tons
Minimum weight per yard of rail on which locomotive could run	58 lb rail	76 lb rail	59 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	52"	57"	52"
Boiler Pressure	180 psi	215 psi	180 psi
Cylinders (dia x stroke)	25" x 28"	25" x 30"	25" x 28"
Tractive Effort	51490 lbs	60115 lbs	51490 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.40	3.78	3.42
	Heating Ability
Firebox Area	227 sq. ft		227 sq. ft
Grate Area	64.70 sq. ft	64.70 sq. ft	64.60 sq. ft
Evaporative Heating Surface	2610	3159	2600
Superheating Surface	579	693	563
Combined Heating Surface	3189	3852	3163
Evaporative Heating Surface/Cylinder Volume	164.07	185.34	163.44
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	11646	13911	11628
Same as above plus superheater percentage	13975	16693	13954
Same as above but substitute firebox area for grate area	49032	0	49032
Power L1	8783	0	8632
Power MT	553.23	0	540.63