線, せん
Noun, used as a suffix
1. line, stripe, stria
2. line (e.g. telephone line), wire
See X線
3. ray (e.g. X-ray), beam
4. line (e.g. of a railroad), track, route, lane
5. outline, contours, form
この線の終点はどこですか。
は
Particle, pronounced わ in modern Japanese
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis