1st hour schedule - 1st hour schedule

Japanese: 1時間目ダイヤ - いちじかんめだいや
1st hour schedule - 1st hour schedule

…Depending on the purpose, there are various types of time increments: 1 hour, 10 minutes, 2 minutes, and 1 minute. The 1 hour timetable allows a good understanding of the overall train operation situation, so it is used for long-term train planning and daily train operation management, while the 2 minute timetable can display train operation times accurately in 15 second increments, so it is widely used for actual work planning. Note that the 1 minute timetable is used on sections such as the Yamanote Line and Keihin Tohoku Line, where the timetables are also very dense. …

*Some of the terminology used in reference to the "first hour timetable" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…時間の刻みは用途により,1時間目,10分目,2分目,1分目の各種類がある。1時間目ダイヤは全体の列車運転状況がよく把握できるため,長期列車計画,毎日の列車運転管理などに使用されており,2分目ダイヤは15秒単位で列車の運転時刻を正確に表示できるため,実際の作業計画策定などに広く使用されている。なお,山手線,京浜東北線などの区間ではダイヤも稠密(ちゆうみつ)なため1分目ダイヤを使用している。…

※「1時間目ダイヤ」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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