(せん)

せん
suffix, noun
line; route; wire (suffix)
1. line; route
Suffix indicating a railway line, route, or path.
The line at 0 degrees longitude is called the prime meridian.
I take the Yamanote Line.
2. wire; cable
Suffix indicating a type of wire or cable.
The phone line was cut.

(せん) is a suffix for lines, routes, and wires.

SENSE 1 - Lines/Routes:

Railway lines

Geographic lines

SENSE 2 - Wires/Cables:

Other