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.

The superheated Class H became Class C11, whilst the saturated Class I became Class C10. All six saturated C10s had superheaters fitted between 1923 and 1925, and were reclassified as Class C11. The saturated engines had conventional drain cocks, but the superheated engines had drain cocks that fed to a 'rose' valve positioned between the frames.

(Those which remained saturated were briefly designated class I or LNER class C10, but all were superheated by 1925 and became class C11.) The largest and most powerful locomotives ever built by the NBR.

The LNER 4-4-2 Atlantic Locomotives. Britain's first Atlantic appeared on the Great Northern Railway (GNR) in 1898 as an enlargement of the ubiquitous 4-4-0 for express work, building 116 examples of various designs.

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.

Ex-North British Railway Class H (LNER Class C11) 4-4-2 No. 9903 Cock o' the North heads an Edinburgh Waverley to Perth slow train at Inverkeithing Station, circa 1927. This locomotive was built by Robert Stephenson & Co. and entered service as NBR No. 903 in August 1911.

This download shows the number of locomotives built for LNER stock for each year from 1923 to 1947, plus locomotives of LNER design built after nationalisation. It combines the annual figures given in the Locomotive Policy and Construction section of Volume 1 (pp15-21).

Class C11. Class Details Reid NBR Class I (LNER Class C10) without supperheaters and NBR Class H (LNER Class C11) when rebuilt with superheaters. C10: Weight: 76 tons 14; Cyls 20x28; DW: 6 ft 9; TE: 22,331lbs. C11: Weight: 74 tons 8; Cyls 21x28; DW 6 ft 9; TE: 23,324 lbs

The original 19-part series is available in three formats: Eight printed books available to purchase from Amazon. Links available via the RCTS Digital Archive shop. The eight PDFs and books are grouped as shown in the table. Online viewing is organised by original part and locomotive class.