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track gauge : ウィキペディア英語版
track gauge

In rail transport, track gauge is the spacing of the rails on a railway track and is measured between the inner faces of the load-bearing rails.
All vehicles on a network must have running gear that is compatible with the track gauge, and in the earliest days of railways the selection of a proposed railway's gauge was a key issue.
As the dominant parameter determining interoperability, it is still frequently used as a descriptor of a route or network.
There is a distinction between the nominal gauge and actual gauge at some locality, due to divergence of track components from the nominal. Railway engineers use a device, like a caliper, to measure the actual gauge, and this device is also referred to as a track gauge.
==Nominal track gauge==
The nominal track gauge is the distance between the inner faces of the rails. In current practice it is specified at a certain distance below the rail head as the inner faces of the rail head (the ''gauge faces'') are not necessarily vertical.
Rolling stock on the network must have running gear (wheelsets) that are compatible with the gauge, and therefore the gauge is a key parameter in determining interoperability, but there are many others—see below. In some cases in the earliest days of railways, the railway company saw itself as an infrastructure provider only, and independent hauliers provided wagons suited to the gauge. Colloquially the wagons might be referred to as "four-foot gauge wagons", say, if the track had a gauge of four feet. This nominal value does not equate to the flange spacing, as some freedom is allowed for.
An infrastructure manager might specify new or replacement track components at a slight variation from the nominal gauge for pragmatic reasons.

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「track gauge」の詳細全文を読む



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