noun
telegraph office
A historical office where telegrams were sent and received. Now largely obsolete, but may appear in historical contexts.
昔、電報局で電報を打ってもらった。
Long ago, I had a telegram sent at the telegraph office.
郵便局 is a post office, which still exists today, while 電報局 is a historical telegraph office.
Compound of 電報 (telegram) and 局 (office). The term reflects the historical institution of telegraph offices.