Because there is a significant difference in the amount of users between the two sections, between Osaka and Sasayamaguchi and between Sasayamaguchi and Fukuchiyama, four cars are added to or disconnected from the rapid trains that run all the way through these sections at Sasayamaguchi station, so eight-car rapid trains are operated between Osaka and Sasayamaguchi while four-car rapid trains are operated between Sasayamaguchi and Fukuchiyama.
大阪～篠山口間と篠山口～福知山間では乗客数に大きな差があるため、一部の全線直通運転の快速列車は篠山口駅で増解結が行われ、大阪～篠山口間では8両、篠山口～福知山間では4両で運転される。