幹線 かんせん結合 けつごう じゃありませんでした
kansenketsugō kija arimasendeshita

Noun
Desu Copula

The polite, past negative form of 幹線結合器

1. Was not a main line coupler.; Was not a trunk line connector.

Past/Perfective
Negative
Polite
Terminal Form
Computing