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Construction year: 1907
Numbering locomotives: 20.001 - 20.010
Type of locomotief:    ( American )   4-6-0

Mechanism
     Diameter of cylinders (d) : 500 mm
     Piston stroke (l) : 660 mm
     Diameter of driving wheels (D) : 1,980 m

Kettle
     Kettle pressure (P) : 13,5  kg/cm²

     Grid
          Length: 1,937 m
          Width: 1,070 m
          Surface area (G) : 2,07

     Heating surface of the firebox: 12,21

     Heating surface of the firebox
          Small fire tubes
               Diameters : 40/45 mm
               Amount: 153
              Surface area 72,50
          Big fire tubes
               Diameters : 118/127 mm
               Amount: 18
               Surface area 25,40

          Total heating area (S) : 109,81
     Diameter superheater pipes: 27/34  mm
     Overheating surface (S1) : 26,85

     Boiler hull
          Average diameter: 1,427 m
          Plate thickness: 15 mm

     Thickness fireboxplates: 16 en 20 mm
     Material fireboxplates: Copper

     Thickness fireboxplates
          Sky plate: 20 mm
          Rear and side plates: 14,5 mm
          Pipe plate: 16 tot 27 mm

     Thickness of pipe plate - Smoke box: 22 mm
     Content of the ride-on kettle: 4,050
     Steam chest volume: 1,100
     Surface area of steam release: 6,20

Ratio S/G : 53
Ratio S1/S: 0,245
Weight empty locomotive: 54 ton
Adhesion weight (A): 36,9 ton
Ratio T/A: 1/5,04
Towing capacity: T= 0,35 Pd²l    7 320 kg
                                       D

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