however , because the line is a single track and no passing facilities are installed at kosei station and other stations , it is difficult to increase the number of trains by more than two an hour (including rush hours ) in order to enhance the convenience; therefore , the local governments and residents are requesting that jr west use double-tracking and increase the number of trains . とはいえ単線であり、また甲西駅等に行き違い設備がないことから、ラッシュ時も含め1時間に3本以上の列車本数の増加は難しく、利便性向上は望めないため自治体・住民からはJR西日本に対して複線化・増発要望が出ている。