noun
Abbreviation of 快速急行, a type of express train service in Japan. Used primarily in railway announcements, timetables, and signage.
See also: 快速急行
次の快急は、新宿に停車します。
The next rapid express will stop at Shinjuku.
Express train, generally slower than a rapid express and with more stops.
Abbreviation of 快速急行 (rapid express), formed by taking the first kanji of each component.