an older or pre-existing rail line, as opposed to any newer line servicing the same area / the non-bullet train JR railway lines, the regular train lines as opposed to the shinkansen

underground line, specifically an underground cable or wire

(geography) a tropic

(meteorology) isotherm

ground (earth) wire; earthed line

Kyūjitai form of 経線 (“longitude”)

(geometry, engineering) extended line (usually as an auxiliary line) / extension of a traffic route (e.g. highway or railway line) / (figuratively) extension or result developed from an existing thing

(technology) Synonym of アンテナ (antena, “antenna”); an aerial (device for receiving or transmitting)

borders (outer lines) of a box

copper wire