This is the 3203rd most frequent Japanese word.
国鉄
"国鉄" (Kokutetsu) refers to the Japan National Railways (JNR), the former state-owned railway operator in Japan.
Here, '国鉄' refers to the historical Japan National Railways, which was a government-owned railway corporation until its privatization in 1987.
国鉄は日本の国有鉄道でした。
The National Railways of Japan was a state-owned railway.
In this sentence, '国鉄' indicates the organization Japan National Railways, highlighting it as an employer in a past context.
彼は国鉄に勤めていました。
He was employed by the National Railways.
Here, '国鉄' is used to evoke nostalgia for the era when Japan National Railways existed, reflecting a temporal cultural reference.