Verified answer

ALL 4 kanji can - depending on the context - be pronounced "eki". By the way, there are about TWELVE more kanji that can be pronounced "eki" - to name just the 5 most frequent ones: 益　易　疫　亦　腋　

How come?

Japanese is a language that has MANY homophones: words or syllables that sound the same but have different meanings. "Many" is a sort of understatement: there are exceedingly many homophones - for historical reasons too complicated to summarize in a few words.

This, as you can well imagine, is the reason why Japanese keep their kanji: the kanji conveys ONE meaning, independent of what the pronounciation is.

Yooooo I just learned that word it means railway station and the Kanji is 駅.

Kanji is learned like that. The Chinese mean different things next to each other.

日本 means Japan. If you take away "日". You are left with 本 which means book. Which I was like WTF when I first found that out.

I realized that the symbols have meaning like 電 (den) is the symbol for electricity. 車 (kuruma) is the symbol for car. Combining it makes; 電車 is electric train. It wouldn't be written as "Den kuruma" though its "Densha" which is electric train or でんしゃ.