Waihangahia tētahi putanga matatini ake o tēnei rerenga Ko te hoahoa o te Kāwai 156 i nui ake te tiaki i te hoahoa o te Kāwai 151 o Metro Cammell.
Ko te tikanga, he putanga matatini ake o te rerenga ko "Ko te hoahoa o te Class 156 he mea tiaki ake i te hoahoa Class 151 o Metro Cammell o mua, i hangaia te tinana i te maitai hei utu mo te Aluminium, a ko te hoahoa o te kaakahu he rite tonu ki te BREL Class 150 hei awhina i te whakaaetanga o te uniana. "