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NER Class Z information


NER Class Z
LNER Class C7
Type and origin
Power typeSteam
DesignerVincent Raven
BuilderNorth British Locomotive Co.
Build date1911–1918
Total produced50
Specifications
Configuration:
 • Whyte4-4-2
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.3 ft 7+14 in (1.099 m)
Driver dia.6 ft 10 in (2.083 m)
Trailing dia.4 ft (1.219 m)
Tender wheels3 ft 9+14 in (1.149 m)
Wheelbase53 ft 3+910 in (16.253 m) ​
 • Engine29 ft 6 in (8.992 m)
 • Tender12 ft 8 in (3.861 m)
Axle load20+45 t (20,800 kg)
Loco weight79+45 t (79,800 kg)
Tender weight46+35 t (46,600 kg)
Total weight125+310 t (125,300 kg)
Fuel typeCoal
Firebox:
 • Grate area27 sq ft (2.5 m2)
Boiler:
 • Diameter5 ft 6 in (1.676 m)
 • Small tubes90 x 2 in
 • Large tubes24 x 5.25 in
Boiler pressure175 psi (1,210 kPa)
Heating surface:
 • Firebox185 sq.ft.
 • Tubes763.9 sq.ft.
 • Flues534.5 sq.ft.
Superheater:
 • Heating area392 sq.ft. (24 x 1.1 in)
Cylinders3
Cylinder size16.5 in × 26 in (420 mm × 660 mm)
Valve gear
  • C7/1: Stephenson
  • C7/2: Lentz rotary cam
Valve type
  • C7/1: Piston valves
  • C7/2: poppet valves
Career
Operators
  • North Eastern Railway
  • London and North Eastern Railway
  • British Railways
ClassNER Z, LNER C7
Withdrawn1943–1948
DispositionTwo rebuilt into Class C9 (see below), remainder scrapped
LNER Class C9
Type and origin
Power typeSteam
DesignerNigel Gresley
Rebuild date1931
Number rebuilt2
Specifications
Configuration:
 • Whyte4-4-2
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.3 ft 7+14 in (1.099 m)
Coupled dia.6 ft 10 in (2.083 m)
Trailing dia.3 ft 8 in (1.118 m)
Tender wheels3 ft 8 in (1.118 m)
Wheelbase55 ft 7 in (16.942 m)
Axle load20+120 t (20,000 kg)
Total weight135+25 t (135,400 kg)
Fuel typeCoal
Firebox:
 • Grate area2,317+35 sq ft (215.312 m2)
Boiler:
 • Diameter5 ft 7+14 in (1.708 m)
 • Small tubes143 x 2 in
 • Large tubes24 x 5.25 in
Boiler pressure200 psi (1,400 kPa)
Heating surface:
 • Firebox203 sq.ft.
 • Tubes1,178.4 sq.ft.
 • Flues519.2 sq.ft.
Superheater:
 • Heating area417 sq.ft. (24 x 1.2 in)
Cylinders3
Cylinder size16.5 in × 26 in (420 mm × 660 mm)
Valve gearStephenson
Career
OperatorsLondon and North Eastern Railway
ClassC9
Number in class2
Numbers727, 2171
Withdrawn1942–1943
DispositionBoth scrapped

The NER Class Z (LNER Class C7) was an Atlantic class of locomotives designed by Vincent Raven. It was introduced in 1911.

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