Before introducing the JR (West) Commuter Train Series 207, JNR/JR Commuter Train Series 201 and JNR/JR Commuter Train Series 205 would also enter the Kosei Line, but eventually they were replaced with the JR (West) Commuter Train Series 207 and today are not regularly used.
207系電車投入前は国鉄201系電車や国鉄205系電車も湖西線に入線していたが、207系投入後順次置き換えられ、現在は定期運用はない。