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Nilgiri Mountain Railway X class
The X class locomotives are a class of metre gauge 0-8-2T rack and pinion compound locomotives working on the Nilgiri Mountain Railway in the Nilgiri Hills of southern India. They are used on the 20 km section between Coonoor and Kallar where the gradient of the track can be as steep as 1 in 12.5. At these steep sections, the railway uses the Abt system. The X class locomotives are compound locomotives with two high-pressure and two low-pressure cylinders. All cylinders are outside the locomotive's frames. The two low-pressure cylinders drive the rack wheels. These cylinders are positioned above the two main high-pressure cylinders, which drive the main wheels.
Engines of this class were first brought as replacements for the line's original Beyer-Peacock 2-4-0 engines whose traction power was too weak for the traffic. The X class locos were bought in two batches from the Swiss Locomotive and Machine Works, Winterthur, Switzerland. The first batch (12-nos.) were brought into operation over the years between 1920 and 1925 and the newer batch (5-nos.) in 1952.〔〔(【引用サイトリンク】title=National Railway Museum )〕
== New Builds ==
Four new oil-fired steam locomotives have been ordered to ease the load on the existing X class locomotives. They are basically the same design as the older locomotives. The first of these, No. X 37396, arrived in Feb 2011 and entered service on March 24, 2011. The second oil fired steam engine, No. X 37397, was rolled out at Golden Rock in Feb. 2012, and is to enter service on NMR in March 2012. The third indigenous steam engine built by Goden Rock Workshop, Trichy, X 37398 entered service in March 2013. The last of four oil fired steam engines of X Class 0-8-2T rack and pinion compound engine bearing road number X 37399 was rolled out on March 5, 2014 at the Central Workshop, Ponmalai, Tiruchirapally. It is expected to join the fleet after trials on the rack railway.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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