GNR C2 Small Atlantic ("Klondike")

By the late 1890s the Great Northern Railway's East Coast expresses were heavier than the Stirling Singles of 1870–1895 could comfortably handle. Patrick Stirling's death in office in November 1895 led to the appointment of Henry Ivatt as Locomotive Engineer, and Ivatt arrived from Inchicore on the Great Southern & Western of Ireland with a clear sense that the Singles were obsolete and that a substantially larger four-coupled engine was needed.

Ivatt's answer was the Atlantic, a 4-4-2 with a wide firebox supported by a trailing axle, taking advantage of the recent American development of the type for express working. The first engine, No. 990, emerged from Doncaster Works in 1898, the first 4-4-2 in Britain and the first British engine to use the wide firebox arrangement that would dominate British express engineering for the next 70 years.

The colloquial name "Klondike" came from the contemporary Yukon Gold Rush of 1897–1898. The engines arrived in service just as the gold rush was peaking, and the name was applied affectionately to the new machines. The class became LNER class C2 from 1923, with the related and larger Ivatt Large Atlantic of 1902 being LNER class C1, an unusual reversal of the more common practice of giving lower class numbers to earlier or smaller types.

Production extended over five years across several Lots, with detail variations between batches. From 1908 onwards a small number of Klondikes were fitted with Schmidt superheaters as part of the GNR's general modernisation programme. Total construction reached 22 engines.

The Klondikes worked the principal GNR East Coast main-line expresses through the early 1900s. The class's wide firebox and freer steaming gave them a substantial performance advantage over the Stirling Singles they replaced, allowing the GNR to lengthen its express loadings without compromising schedule.

The class's service life was significantly affected by the introduction of Ivatt's own enlarged Large Atlantic (the C1) in 1902. The C1 had a much larger boiler, Belpaire firebox, and improved performance, and once the C1 was in numbers from 1902 onwards, the smaller Klondikes were progressively transferred to secondary expresses.

Through the LNER era from 1923 the class continued on East Coast secondary express, parcels and seasonal holiday work. The introduction of Gresley's A1 Pacifics from 1922 onwards further displaced the Klondikes from front-line work. Withdrawal began in 1935 and was complete by 1937, the entire 22-engine class extinct just before the Second World War.

Of the 22, only the prototype No. 990 Henry Oakley was retained for the National Collection. The other 21 were scrapped at LNER scrapyards. The Klondike is therefore represented in preservation by the most historically-significant member, the first British Atlantic.

The first British Atlantic, a 4-4-2 with a wide firebox supported by a trailing axle, contrasting visibly with the single-driver outline of its predecessor on the East Coast main line. The Klondike was distinctive for its relatively small boiler, slender outline, polished brass safety-valve casing on a saturated boiler dome, and the GNR's standard polished green livery. The colloquial name "Klondike" came from the contemporary Yukon gold rush; the engines arrived just as the gold rush was peaking and the name stuck. The Klondike is structurally distinguishable from the larger Ivatt C1 Atlantic by the smaller boiler diameter, a key visual difference even at distance.

No. 990 Henry Oakley, the prototype, completed at Doncaster in 1898 as the first British Atlantic and the first 4-4-2 wheel arrangement in Britain. Named after Henry Oakley, the GNR's Locomotive Engineer in the late nineteenth century. The engine was retained by the GNR for its historical significance on withdrawal from regular service and is now part of the National Collection at the National Railway Museum.

251, the prototype Large Atlantic of 1902 (LNER class C1), an enlargement of the Klondike with a much larger boiler, Belpaire firebox and improved performance. Note that 251 is technically a different class (the C1 not the C2), although it shared design heritage with the Klondike. 251 is also preserved in the National Collection at York.

GNR era (1898–1922): the entire class was concentrated on East Coast express working. Major Klondike allocations were at King's Cross Top Shed (the largest contingent), Doncaster (works-allocation for maintenance), and York (for the East Coast Joint working with the NER). The class worked the principal GNR Anglo-Scottish day expresses out of King's Cross.

LNER era (1923–1937): the class continued on East Coast secondary expresses through the LNER period. The introduction of Gresley's A1 Pacifics from 1922 onwards displaced the C2 from front-line work, and the class was progressively transferred to lighter expresses, parcels and seasonal holiday services.

Withdrawal: the class was progressively withdrawn through the 1930s. The last C2 in regular LNER service was withdrawn in 1937, the entire 22-engine class extinct just before the Second World War.

GNR (1898–1922): Great Northern Apple Green with elaborate black-and-cream lining, polished brass safety-valve casing, copper-capped chimney, and the GNR coat of arms on the leading splasher.

LNER (1923–1937): initially retained GNR Apple Green; from 1928 progressively repainted into LNER apple green (a slightly different shade) with yellow lining.

Preservation (No. 990, 1937–present): the surviving prototype has been maintained throughout in GNR Apple Green livery, restored to a high standard at York. Briefly painted in LNER apple green for film and television projects but generally returned to GNR appearance.