共通 きょうつう せん信号 しんごうではありませんでした
kyōtsūsenshin gōdewa arimasendeshita

Noun
Desu Copula

The polite, past negative form of 共通線信号

1. Was not a common route signal.; Was not a shared line signal.

Past/Perfective
Negative
Polite
Formal Register
Computing