SNCB Steamlocomotives

Construction year: 1938
Numbering locomotives: 12.001 - 12.006
Type of locomotief:    ( Atlantic )   4-4-2

Mechanism
     Diameter of cylinders (d) : 480 mm
     Piston stroke (l) : 720 mm
     Diameter of driving wheels (D) : 2,100 m

Kettle
     Kettle pressure (P) : 18  kg/cm²

     Grid
          Length: 2,500 m
          Width: 1,480 m
          Surface area (G) : 3,70 m²

     Heating surface of the firebox: 16,50 m²

     Heating surface of the firebox
          Small fire tubes
               Diameters : 45/50 mm
               Amount: 123
              Surface area 81,50 m²
          Big fire tubes
               Diameters : 125/123 mm
               Amount: 33
               Surface area 60,70 m²

     Surface area of the cooking tubes: 1,90 m²
     Total heating area (S) : 160,60 m²
     Diameter superheater pipes: 28/35  mm
     Overheating surface (S₁) : 63 m²

     Boiler hull
          Average diameter: 1,670 m
          Plate thickness: 15 mm

     Thickness fireboxplates: 14 mm
     Material fireboxplates: Copper

     Thickness fireboxplates
          Sky plate: 14 mm
          Rear and side plates: 15 mm
          Pipe plate: 15 tot 28 mm

     Thickness of pipe plate - Smoke box: 25 mm
     Content of the ride-on kettle: 6,990 m³
     Steam chest volume: 2,660 m³
     Surface area of steam release: 9,92 m²

Ratio S/G : 43,4
Ratio S₁/S: 0,392
Weight empty locomotive: 89 ton
Adhesion weight (A): 46 ton
Ratio T/A: 1/4,31

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