The line in the middle of a fraction is called the "vinculum."
Please get on the Yamanote Line at Shibuya.
You really thought this line was perfect? It’s not even close to straight!
The kanji and the word are exactly the same. That means they share meanings as well. This also works for "train lines" as well. You'll see this attached onto the ends of names describing them.
The reading you learned with the kanji is the same for this vocab word. Enjoy it!