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On a railway, the platform height refers to the height of a railway platform Above Top of Rail (ATR). A related term is "train floor height" which is the height of the floor of the rail vehicle. Worldwide, there are a large number of incompatible standards for platform heights and train floor heights. When raised platforms are in use, the train width must also be compatible, to avoid both large gaps or mechanical interference which causes equipment damage. Differences in platform height (and platform gap) can pose a risk for passenger safety. Platform ramps, steps, and platform gap fillers together with hazard warnings such as "mind the gap" are used to reduce risk and enable access. Platform height affects the loading gauge (the maximum size of train cars), and must conform to the structure gauge physical clearance specifications for the system. Tracks which are shared between freight and passenger service must have platforms which do not obstruct either type of railroad car. To reduce station construction costs, many train systems use a low platform, and require passenger cars with internal stairs up to the train floor. ==Height categories== Buses, trams, trolleys and railway passenger cars are divided into several typical categories. * Ultra Low Floor tram – * Low floor tram – * High floor tram – more than * Low floor train – * Train (in UK or narrow gauge) – * Standard North American passenger cars – * Train (standard gauge (except UK) or broad gauge) – 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「railway platform height」の詳細全文を読む スポンサード リンク
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