{"product_id":"part-built-7-14-inch-gauge-orenstein-koppel-rack-locomotive-stock-code-2140","title":"Part-built 7 1\/4 inch gauge Orenstein \u0026 Koppel rack locomotive","description":"\u003cp class=\"MsoNormal\"\u003eSince the ruling gradient at the new house Im trying to   buy is about 1 in 4, Im half wondering whether I should keep this one myself.   \u003co:p\u003e \u003c\/o:p\u003e \u003c\/p\u003e   \u003cp class=\"MsoNormal\"\u003eA 7  inch gauge model of one of the Orenstein \u0026amp;   Koppel rack \u0026amp; pinion locomotives supplied to the railway at Chambery, France   in 1909 for working a combination of normal adhesion and rack sections over the   route. The model design was done by Ken Swann (he of Bridget and   Wren fame) in the 1980s and written up in Engineering in Miniature   producing a unique engine of rather nice proportions and a high degree of   technical interest.   \u003co:p\u003e \u003c\/o:p\u003e \u003c\/p\u003e   \u003cp class=\"MsoNormal\"\u003eThe original O\u0026amp;K design was an 0-4-0 well and side   tank. The cylinders were mounted high up at the front, driving a jackshaft   mounted beneath the boiler, connected via gears to a crankshaft on which was   mounted the rack pinion and two flycranks driving the wheels via a T-shaped   connecting rod forming a Scotch crank. Since there were only two gears in the   drive train, the jackshaft ran in the opposite direction to the wheels, which   makes for an interesting sight. Ever the practical miniature locomotive man, Ken   Swann interposed a dog clutch in the drive, allowing the engine to be run out   of gear which is entertaining for spectators and useful for the driver, since   the axle pump works off the jack shaft and can be used to fill the boiler whilst   standing in the station!   \u003co:p\u003e \u003c\/o:p\u003e \u003c\/p\u003e   \u003cp class=\"MsoNormal\"\u003eWork to date is to a high standard and comprises   \u003co:p\u003e \u003c\/o:p\u003e   the main chassis, incorporating a well tank, assembled including gunmetal   axleboxes and roller bearings for the jackshaft. The rear subframe which   supports the cab and dragbeam is largely complete and simply requires bolting   on. The axles and wheels are keyed for accurate quartering and could be   assembled, along with the cylinders to give a largely complete rolling chassis.\u003cbr\u003e    \u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eChassis with well tank, gunmetal axle boxes, axles and wheels,   buffer beams\u003cbr\u003e    \u003cspan style=\"font-family:Symbol\"\u003e\u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eSet machined cylinders, end covers, valve chest covers, ports to   be drilled\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eComplete weighshaft \u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eJackshaft and machined flywheels\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eDog clutch assembly complete\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eRack pinion and final drive pinion assembly complete\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eConnecting rods, crankpins, nuts and bushes\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eFlycranks complete with crankpins\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eSmokebox tube, unmachined gunmetal back ring, flamecut steel front   ring, steel smokebox door pressing\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eSet Riggenbach Patent plates\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eDome casting\u003cspan style=\"font-family:Symbol\"\u003e\u003cbr\u003e     \u003cspan times=\"\" new=\"\" roman\u003e \u003c\/span\u003e\u003c\/span\u003eBrass tank sides\u003c\/p\u003e   \u003cp class=\"MsoNormal\"\u003eThere are many more parts in a box with the engine   and a complete set of the \"Engineering in   Miniature\" articles in two ring-binder folders.   \u003co:p\u003e\u003c\/o:p\u003eThere is   very light surface rusting to some components, this comes off easily with   Scotchbrite. \u003c\/p\u003e   \u003cp class=\"MsoNormal\"\u003eAlthough designed as a rack engine, many Koppels have   now been built and acquit themselves admirably as adhesion engines on the   typical club track.   \u003co:p\u003e\u003c\/o:p\u003eThey are a good size to drive, being based   on a 600mm gauge prototype. \u003c\/p\u003e \u003cspan style=\"font-size:12.0pt;font-family:\" times=\"\" new=\"\" roman mso-bidi-language:ar-sa=\"\"\u003eLength 40 inches\u003c\/span\u003e  \u003cp\u003e \u003c\/p\u003e  \u003cdiv\u003e      \u003c\/div\u003e","brand":"Station Road Steam","offers":[{"title":"Default Title","offer_id":54020016144725,"sku":"2140","price":495.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/0094\/2677\/files\/2140-1.webp?v=1779909574","url":"https:\/\/stationroadsteam.com\/products\/part-built-7-14-inch-gauge-orenstein-koppel-rack-locomotive-stock-code-2140","provider":"Station Road Steam","version":"1.0","type":"link"}