Reviews had been made to select, in principle, lowest-numbered extant steam locomotives (#1 if possible) for preservation, but there are some steam locomotives, such as the Class C62 #2, that were not originally planned for preservation.
保存対象車両は原則として現存するもっとも若番の車両（できれば1号機）を選定するよう検討を重ねられていたが、C62形2号機のように、当初は保存予定になかった車両もある。