日本にっぽん国有こくゆう鉄道てつどうでしょう
nipponkokuyūtetsudōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 日本国有鉄道

1. Probably Japan National Railways.; It must be Japan National Railways.

Polite
Presumptive
Conjecture