Regional Rapid Service; Section Rapid Service
A JR West train service that operates as a local train on some sections and as a rapid service on others. The English name 'Regional Rapid Service' is the official JR West designation.
I took the Regional Rapid Service from Osaka to Himeji.
The Section Rapid Service stops at every station from a certain point along the route.
Compound of 区間 (section, interval) and 快速 (rapid service), reflecting the train's operation as a rapid service only on certain sections of the line.