GNR Class C1 (small boiler)

The Great Northern Railway (GNR) Small Boiler Class C1 is a class of steam locomotive, the first 4-4-2 or Atlantic type in Great Britain. They were designed by Henry Ivatt in 1897. In total 22 were built between 1898 and 1903 at Doncaster Works. The class were commonly known as 'Klondykes' [sic], after the 1897 Klondike gold rush. They could reach speeds of up to 90 mph (145 km/h). They were also known as Small Atlantics.

This article is about the class classified C2 by the LNER. For the class classified C12 by the LNER (C2 by the GNR), see GNR Class C2.

Great Northern Railway small boiler class C1
London & North Eastern Railway class C2
The first Atlantic tender locomotive in Great Britain, 990 Henry Oakley is preserved at York.
Type and origin
Power typeSteam
DesignerHenry Ivatt
BuilderDoncaster Works
Serial number769, 872–881, 974, 996–1003, 1005–1006
Build date1898–1903
Total produced22
Specifications
Configuration:
​
 • Whyte4-4-2
 • UIC2′B1′n2s
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.3 ft 8 in (1.118 m)
Driver dia.6 ft 8 in (2.032 m)
Trailing dia.3 ft 8 in (1.118 m)
Loco weight60.00 long tons (60.96 t; 67.20 short tons)
Fuel typeCoal
Water cap.3,670 imp gal (16,700 L; 4,410 US gal)
Boiler pressure170 psi (1.2 MPa) (saturated)
160 psi (1.1 MPa) (superheated)
CylindersTwo, outside (3271: inside)
Cylinder size18.75 in × 24 in (476 mm × 610 mm) (Saturated)
19 in × 24 in (483 mm × 610 mm) (Superheated)
Valve gearStephenson
Performance figures
Tractive effort15,240 lbf (67.8 kN) (Saturated)
14,728 lbf (65.5 kN) (Superheated)
Career
Operators
NumbersGNR: 250, 252–260, 271, 949–950, 982–990
NicknamesKlondyke
Withdrawn1935–1946
Preserved990 Henry Oakley
DispositionOne preserved, remainder scrapped
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