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A railgrinder (or rail grinder) is a maintenance of way vehicle or train used to restore the profile and remove irregularities from worn rail track to extend its life and to improve the ride of trains using the track. Rail-grinding equipment may be mounted on a single self-propelled vehicle or on a dedicated rail grinding train which, when used on an extensive network, may include crew quarters. The grinding wheels, of which there may be more than one hundred, are set at controlled angles to restore the track to its correct profile. The machines have been in use in North America, UK and Europe since the early 20th century. They are made by specialist train maintenance companies who may also operate them under contract. The early 2000s saw several advancements in rail maintenance technology, most notably the introduction of track re-profiling by rail milling trains for which advantages in accuracy of the profile and quality of the processed surface are claimed. A second technology which is gaining widespread acceptance in Europe, Germany in particular, is "High Speed Grinding". While it cannot re-profile rails like milling or other grinding trains, its working speed of approximately 80km/h allows defect removal and prevention to be achieved with little or no impact on other scheduled traffic. == Hand-held rail grinders == The ERICO Company designs and produces hand-held rail grinders and drills for the railway industry as maintenance of way tools. ERICO uses Honda four-stroke engines to power their railway drill and rail grinder which have been reported to be ergonomic and easy to refuel. ERICOs primary goal in manufacturing maintenance of way equipment is producing safe, reliable and effective equipment for public and private industry. ERICO also recognized the need for a metal replacement handguard for the SBG150 grinder having received customer feedback concerning the safety of operators using the grinder while located in isolated stretches of track in poor weather. ERICO has made efforts to expand its current selection of hand tools to accommodate the maintenance of way market and traditional signalman requirements. Rail grinders were originally used for rail preparation prior to the attachment of bonds, but now also serve as a multipurpose tool capable of rail prep, maintenance and repair 〔Mischa, W. (2006). Railway Track and Structures: Getting the job done, v 102, n 12, p 22-27〕 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「railgrinder」の詳細全文を読む スポンサード リンク
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