Translation guide
A branch line is a secondary railway line that diverges from a main line. In Japanese, this is most commonly expressed with the term 支線 (しせん). This guide covers how to refer to branch lines in various contexts, from everyday conversation to formal railway terminology.
支線
branch line (railway)
Referring to a railway line that branches off from a main line.
The standard term for a branch line in railway contexts. Used in both spoken and written Japanese.
この支線は本線から分岐しています。
This branch line diverges from the main line.
支線の終点で降りてください。
Please get off at the end of the branch line.
Refers to a local line, which is often a branch line serving rural areas. Carries a nuance of being less busy or less important.
このローカル線は景色がきれいです。
This local line has beautiful scenery.
Literally 'branch line', but less common than 支線. Sometimes used in technical or descriptive contexts.
この鉄道網には多くの枝線があります。
This railway network has many branch lines.
Referring to a secondary line that branches off in non-railway contexts, such as plumbing, electrical wiring, or roads.
Used for branch lines in utilities like water pipes, gas lines, or electrical circuits. Also applicable to road branches.
水道の分岐線を修理する必要があります。
We need to repair the water branch line.
Specifically for branch pipes. Common in plumbing and engineering.
枝管から水漏れがしています。
Water is leaking from the branch pipe.
Loanword from English 'bypass'. Used for roads or pipes that divert from the main route, but not exactly a branch line. Can be used when the branch serves as an alternative route.
支線 is a neutral technical term for any branch line. ローカル線 implies a local, often rural, line with infrequent service. Use 支線 when referring to the physical branching, and ローカル線 when emphasizing the character of the line.
このバイパスは渋滞を避けるために使われます。
This bypass is used to avoid traffic jams.