New Orleans, Texas & Mexico 2-10-0 "Decapod" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class D-52 - 51.5 (Locobase 7768)

Data from MP SUBS 7 - 1935 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See the quite detailed overview published by designer Alphonse I Lipetz, "Russian 'Decapod' Locomotives", The Railway Engineer, Volume 43, No 2 (February 1922), pp. 51-54; April 1922, pp. 136-137; July 1922, pp. 249-251; and November 1922, pp. 415-417. (Thanks to Chris Hohl for his 17 November 2018 email and spreadsheet noting the original NOT&M road numbers, detailing the provenance of the locomotive, and noting the original tenders on the Russian engines.)

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). The NOT&M's decks came second-hand from a variety of earlier owners including the Russian Government [USRA 1025, 1085, 1098 from Brooks], St Louis & Hannibal (which had an 85-mile(137 km) line from Hannibal to Gilmore) [USRA 1189], the Marion & Eastern (an Indiana shortline) [USRA 1175 from Baldwin], and the Southern Railway [USRA 8007, 8002, and 8000 from Richmond].

The Russian engines were equipped with tenders carrying 8 metric tons (8.82 short tons) of coal and weighing 134,000 lb (60,781 kg) loaded.

All of the class had 12" (305 mm) piston valves. At least five of these were fitted with Nicholson thermic syphons (Locobase believes this was after they entered NOT&M service) which added 56 sq ft (5.20 sq m) to the firebox heating surface.

The two Baldwins were shown in the next diagram to have had 194 sq ft (18.02 sq m) of firebox heating surface, no arch tubes, and a total evaporative heating surface of 2,590 sq ft. (240.62 sq m). Chris Hohl noted that the two were lighter than the Alcos. Their adhesion weight came to 176,300 lb (79,668 kg) and engine weight was listed as 202,500 lb (91,853 kg). By 1935, they were oil burners with tenders carrying 2,800 US gallons (10,598 litres) of fuel oil.

The two Philadelphians also displayed the two ways to achieve a similar driver diameter. The 947 used the original wheel centers and wide tires while the 948 had new larger diameter wheel centers and standard tires.

The entire class served the NOT&M and successor Missoui Pacific throughout World War II and only went under the scrapper's torch beginning in August 1949 and ending with 945's dismantling in February 1952.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassD-52 - 51.5
Locobase ID7768
RailroadNew Orleans, Texas & Mexico (NOT&M/MP)
Number in Class8
Road Numbers111-118/941-948
Number Built8
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18.67 / 5.69
Engine Wheelbase (ft / m)27.83 / 8.48
Ratio of driving wheelbase to overall engine wheelbase 0.67
Overall Wheelbase (engine & tender) (ft / m)60.33 / 18.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)185,000 / 83,915
Engine Weight (lbs / kg)210,000 / 95,255
Tender Loaded Weight (lbs / kg)132,000 / 59,874
Total Engine and Tender Weight (lbs / kg)342,000 / 155,129
Tender Water Capacity (gals / ML)7400 / 28.03
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3300 / 12,491
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)52 / 1321
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)25" x 28" / 635x711
Tractive Effort (lbs / kg)51,490 / 23355.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.59
Heating Ability
Tubes (number - dia) (in / mm)194 - 2" / 51
Flues (number - dia) (in / mm)28 - 5.375" / 137
Flue/Tube length (ft / m)17 / 5.18
Firebox Area (sq ft / m2)237 / 22.02
Grate Area (sq ft / m2)64.60 / 6
Evaporative Heating Surface (sq ft / m2)2632 / 244.61
Superheating Surface (sq ft / m2)563 / 52.32
Combined Heating Surface (sq ft / m2)3195 / 296.93
Evaporative Heating Surface/Cylinder Volume165.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,628
Same as above plus superheater percentage13,721
Same as above but substitute firebox area for grate area50,339
Power L18711
Power MT519.04

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Wes Barris