YOU SAID:

i understand only railway station

INTO JAPANESE

私は唯一の鉄道駅を理解する

BACK INTO ENGLISH

I only understand the railway station

INTO JAPANESE

私は鉄道の駅しかわからない

BACK INTO ENGLISH

I only know the railway station

INTO JAPANESE

私は鉄道駅しか知りません

BACK INTO ENGLISH

I only know the railway station