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David Jones (1834–1906) was locomotive superintendent of the Highland Railway between 1870 and 1896. He was credited with the design of the first British 4-6-0, which was strongly influenced by the Scottish locomotive design for Indian Railways. The 4-6-0 wheel arrangement that appeared in 1894, quickly became the most common locomotive for main line passenger and mixed traffic work in Britain. Although Jones was a fervent disciple of Alexander Allan, Jones' new designs tended to break away from the Allan tradition, which had lasted so long in Scotland. One Allan feature that Jones did not perpetuate in his 4-6-0s was double framing around the outside cylinders. Allan's straight-link valve gear was, however, retained; this was basically similar to the corresponding Stephenson gear, but the link was easier and therefore cheaper to make and imparted a constant lead irrespective of cut-off. The "Drummond" Castle class was, mechanically, Jones’ personal design, although the Drummond stamp of chimney, cab and 'water-cart' bogie tender was unmistakable. A dubious asset, without which none of the younger Drummond's locomotives was complete, was the provision of steam reverse, a troublesome mechanism if it were not well maintained. With the introduction of the 4-6-0, Highland Railway had thus obviated the 0-6-0 type employed by practically every other British railway, except its most intense competitor, the Great North of Scotland Railway. A 0-6-0, however, would have meant a crank axle, and crank axles did not have a place in Jones' designs. Jones’ new designs also tended to break away from the Allan tradition, although he continued to use the Allan link valve gear. ==Jones locomotive designs== *F class 4-4-0 of 1874–1888 *Two 2-4-0 locomotives built at Inverness in 1877. These had 6' 3" driving wheels, 16" by 22" outside cylinders and 4' 1" diameter boilers with a working pressure of 140psi. Originally numbered 1 'Raigmore' and 3 'Ballindalloch', they were renumbered 29 and 30 in 1898, and were withdrawn in 1910 and 1912 respectively. *O class 2-4-0T of 1878–79 *L class 4-4-0 of 1882–1901 *E class 4-4-0 of 1886 *One 0-4-4 saddle-tank was built at Inverness in 1890 for service on the Strathpeffer branch. Originally numbered 13 and named 'Strathpeffer', it had 4' 3" coupled wheels, 14" by 20" inside cylinders, a 3' 6.5" diameter boiler, and a weight in working order of 32 tons. In 1901 the locomotive was rebuilt by Drummond as a side-tank engine, in which form it was renumbered 53. In 1903 it was renamed 'Lybster' and transferred to that branch.It passed to the LMS in 1923. *''Strath'' class 4-4-0 of 1892 *P class 4-4-0T of 1893 *''Jones Goods'' 4-6-0 of 1894. *''Loch'' class 4-4-0 of 1896–1917 had a very high power/weight ratio and was among the several classes carrying his special louvered chimney. This invention involved the division of the chimney into a central exhaust tube and an outer concentric ring into which air was projected through the louver slits down the front of the chimney casing. The increase in air resistance was induced by deflector plates. By this means, a draught was supplied when the engine was running with its steam cut off, as happened for long stretches on the hilly Highland line. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Highland Railway – Jones locomotives」の詳細全文を読む スポンサード リンク
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