NBR H class

The North British Atlantic, later known as NBR Class H, and then as LNER Class C11 was a class of 4-4-2 steam locomotive of the North British Railway. The class was designed by William P. Reid, Locomotive Superintendent of the NBR, and entered service under his direction. They were the heaviest, longest, and most powerful (by tractive effort) locomotives ever employed on the North British Railway.

NBR Class I (LNER Class C10)
NBR Class H (LNER Class C11)
Locomotive 872 Auld Reekie departs Edinburgh with an express passenger service.
Type and origin
Power typeSteam
DesignerWilliam Paton Reid
BuilderNorth British Locomotive Co. (16)
Robert Stephenson & Co. (6)
Build date1906 (1st batch)
1911 (2nd batch)
1921 (3rd batch)
Total produced22
Specifications
Configuration:
​
 • Whyte4-4-2
Gauge4 ft 8+1⁄2 in (1,435 mm)
Leading dia.3 ft 6 in (1.07 m)
Coupled dia.6 ft 9 in (2.06 m)
Trailing dia.4 ft 3 in (1.30 m)
Length59 feet
Loco weight119 tons 8cwt
Fuel typecoal
Boiler pressure190 psi (1,300 kPa) (C10)
180 psi (1,200 kPa) (C11)
Cylinderstwo outside
Cylinder size20 in × 28 in (510 mm × 710 mm) (C10)
21 in × 28 in (530 mm × 710 mm) (C11)
Performance figures
Tractive effortC10: 22,331 lbf (99.33 kN)
C11: 23,324 lbf (103.75 kN)
Career
OperatorsNorth British Railway
London and North Eastern Railway
NicknamesNorth British Atlantic
DispositionOne briefly preserved but then scrapped. None ultimately survived.

The locomotives passed to the London and North Eastern Railway in 1923. They enjoyed long service, but most were withdrawn during 1936 and 1937, with none surviving into the nationalised British Railways system.

The NBR Class I, later known as LNER Class C10, was a temporary designation of some engines in this class (see below).

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