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To run alongside the line (referring to the train line) means along the train line. What's along the train line? All kinds of things if you look carefully.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私の弟は、京王沿線に住んでいます。
My brother is living along the Keio Line.
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