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Steam
Tender Locomotives with up to Two Coupled Axles
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Tender Locomotives with Four and More Coupled Axles
0-8-0 “Eight-Coupled”
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Baden VIII e
Baltimore & Ohio class E-27
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Belgian Railway type 38
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Canadian Pacific classes N3a, b, c and N2a, b, c
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Central RR of New Jersey classes I-5 and I-6s
Chicago, Rock Island & Pacific (Rock Island) class C-43
Chilean State Railway grupo 20
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Delaware & Hudson No 1400, 1401 and 1402
Delaware, Lackawanna & Western No. 111, 112 and 246 to 248
Denver & Rio Grande Western class C-16
Denver & Rio Grande Western class C-19
Denver & Rio Grande Western class C-28S
Ethiopian Railway No. 21 to 33
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Great Northern (UK) class O2
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Guayaquil and Quito Railway Co. No. 40 to 51
Hejaz Railway Krauss, Jung 2-8-0
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Imperial-Royal State Railways and Austrian Southern Railway class 170
Imperial-Royal State Railways class 270
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Islamic Republic of Iran Railways class 41.11
Italian State Railway class 740
Italian State Railway class 741II
Japanese Government Railways class 9600
London & North Western class E
London, Midland & Scottish Stanier class 8F
Madras & Southern Mahratta class 477
Mexican State Railway class G-031
Mexican State Railway classes G-030 and G-033
New South Wales class D50
New South Wales class D53
New York, Ontario & Western class P
North American Sugar Co. No. 5 “Don Alvaro”
Norwegian State Railways types 19a and 28a, b
Ohio & Mississippi No. 3 and 4
Palatinate Railways G 4III
Paris-Lyon-Méditerranée 140 A
Pennsylvania class H6
Pennsylvania class I
Pennsylvania classes H8, H9 and H10
Prussian G 73
Prussian G 82
Prussian G 83
Rhaetian Railway G 4/5
Rutland class G-34
São Paulo Railway I 60 to 69
Saxon IX V and IX HV
Sfax-Gafsa No. 21 to 28
Sierra Railway No. 20 and 22
Sierra Railway No. 24
Southern Pacific class C-9
Southern Railway (USA) classes K and Ks
Toledo & Ohio Central class G-95a
US Army Transportation Corps class S160 “Liberty”
US Army Transportation Corps Pershing class
War Department Austerity 2-8-0
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Western Maryland class H-4
2-8-2 “Mikado”
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2-10-2 “Santa Fé”
2-10-4 “Texas”
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Page views since 2023-01-26: 13,911,441
Mexican State Railway class G-031
later class GR-3
go back
Mexico | 1936
8 produced
No. 905, ex No. 293 converted to standard gauge, in February 1961 at Oaxaca
No. 905, ex No. 293 converted to standard gauge, in February 1961 at Oaxaca
Greg Maxwell collection

The G-031, sometimes also called GR-031, was a class of superheated Consolidations built for three-foot narrow gauge. It was based on the G-030 and basically had the same boiler. It had the same firebox, but less tubes to make space for the flues which held the superheater elements. The cylinders still measured 18 by 22 inches and the drivers still had a diameter of 41 inches.

Five were built by ALCO-Schenectady in 1936 and numbered 290 to 294. Numbers 295 and 296 followed in 1944. In the same year, the NdeM shops at Acámbaro built No. 297 to the same design. Between 1948 and 1952, the NdeM rebuilt all eight to standard gauge. They were now designated GR-3 and numbered 900 to 907. The class was retired in 1962.

General
Built1936, 1944
ManufacturerALCO, Acámbaro
Wheel arr.2-8-0 (Consolidation) 
Gauge3 ft (Three feet), 4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase18 ft 11 in
Rigid wheelbase11 ft 6 in
Total wheelbase46 ft 8 1/2 in
Service weight118,000 lbs
Adhesive weight110,000 lbs
Total weight208,000 lbs
Axle load27,500 lbs
Water capacity3,600 us gal
Fuel capacity2,146 lbs (oil)
Boiler
Grate area18.7 sq ft
Firebox area79 sq ft
Tube heating area1,154 sq ft
Evaporative heating area1,233 sq ft
Superheater area339 sq ft
Total heating area1,572 sq ft
Power Plant
Driver diameter41 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 18 x 22 in
Power
Power sourcesteam
Estimated power800 hp (597 kW)
Starting effort26,600 lbf
Calculated Values
steam locomotive
freight
Schmalpsur
last changed: 05/2026
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