Due to the 103 series cars on the Yamatoji Line and Nara Line being gathered from various areas in the Kansai and capital regions, there are many train sets that were produced at different times and made in different shapes.
大和路線・奈良線の103系は長年に渡り関西圏や首都圏の各地から寄せ集められたため1編成の製造時期と形態が1両ごとに違う編成が多い。