noun
Regional Rapid Service; Section Rapid Service
Abbreviation of 区間快速 (くかんかいそく), a JR West train service type that stops at every station within a designated section and then runs as a rapid service beyond it.
See also: 区間快速
区快は、大阪環状線内では各駅に停車します。
The Regional Rapid Service stops at every station on the Osaka Loop Line.
次の区快は天王寺行きです。
The next Section Rapid Service is bound for Tennoji.