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GNR Classes D2 and D3 information


GNR Classes D3 and D2
LNER Classes D3 and D4
Type and origin
Power typeSteam
DesignerHenry Alfred Ivatt
Builder
  • Doncaster Works
Build date1896-1899
Total produced51 (later 49)
Specifications
Configuration:
 • Whyte4-4-0
 • UICD4: 2′B′n2
D3: 2′B′n2
Gauge4 ft 8+12 in (1,435 mm)
Leading dia.3 ft 8 in (1,117.600 mm)
Driver dia.6 ft 8 in (2,032.000 mm)
Wheelbase42 ft 10 in (13.06 m)
Height13 ft 9 in (4.19 m) (later cut down to 13 ft 12 in (3.98 m) by the LNER)
Axle loadD4: 14.45 long tons (14.7 t; 16.2 short tons)
D3: 15.7 long tons (16.0 t; 17.6 short tons)
Loco weightD4: 84.2 long tons (85.55 t; 94.30 short tons)
D3: 81.85 long tons (83.16 t; 91.67 short tons)
Fuel typeCoal
Firebox:
 • TypeRound-top
 • Grate area16.25 sq ft (1.510 m2)
Boiler:
 • ModelD4: 4 ft 5 in (1.3 m)
D3:4 ft 8 in (1.4 m)
 • TypeD4: LNER Diagram 11
D3: LNER Diagram 8
Boiler pressure175 psi (1.21 MPa)
Heating surface:
 • FireboxD4: 103 sq ft (9.6 m2)
D3: 105 sq ft (9.8 m2)
 • TubesD4: 1,016 sq ft (94.4 m2)
D3: 1,130 sq ft (105 m2)
 • Total surfaceD4: 1,119 sq ft (104.0 m2)
D3: 1,235 sq ft (114.7 m2)
CylindersTwo, inside
Cylinder size17.5 in × 26 in (444 mm × 660 mm)
Valve gearStephenson valve gear
Valve typeSlide
Performance figures
Tractive effort14,805 lbf (65.86 kN)
Career
NumbersGNR: 400, 1301-1320, 1341-1360
LNER (until 1945/46): 3400, 4301-4320, 4341-4360
WithdrawnD4: 1912-1928
D3: 1935–1951
DispositionAll of the D4s rebuilt as D3s, two D3s rebuilt as D2s, all of the D3s scrapped

The GNR Classes D2 and D3 were two classes of 51 4-4-0 steam locomotives designed by Henry Ivatt for the Great Northern Railway (GNR). They were the first 4-4-0s to be introduced by the GNR, and Ivatt's first original design for the railway as well.[1]

  1. ^ "The Ivatt Class D3 and D4 (GNR D3 and D2) 4-4-0 Locomotives". LNER Encyclopedia.

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