A part
幹線
Shown as a part of 1 word so far, read one way.
かんせん 1 word
- 新幹線しんかんせんShinkansen, "Bullet Train"
新幹線 · here “main line”
Also written with 幹線
These words contain the character in their spelling but show no breakdown that names it, so nothing is claimed about its role in them.