Wannan rukunin yana da kayan aikin jigilar kaya kawai don ci gaba da jigilar kaya irin wannan
na ɗayawa
. Ana buƙatar ƙasa da wuri mafi ƙarfi fiye da mai jigilar kaya, ƙarfinsa saman aji na gaba ɗaya, yana ba da gudummawa ga babban ci gaba a cikin ƙarfin aiki saboda naúrar’Ikon iya canza manyan kundin manyan motoci sama da kankanin lokaci.