Because four-car trains run between Kizu Station and Kyotanabe Station and seven-car trains run between Kyotanabe and Kyobashi Station (as well as the JR Tozai Line), car coupling or splitting is done at this station.
木津～京田辺間は4両編成、京田辺～京橋間（JR東西線以降も同じ）は7両編成で運行されるため、列車の増解結はこの駅で行われる。