tramline

Short definition from Wiktionary

Noun

1. 1
   The rails that a tram runs on.
2. 2
   Either of the two pairs of sidelines marked on a tennis court which mark the outside of the singles and doubles playing areas.
3. 3
   A scratch on a film, usually vertical, that extends through multiple frames.
4. 4
   A mark or bruise having the shape of two parallel lines.
5. 5
   A pair of vertical bars (||) placed to the left of the headword in certain editions of the OED to indicate that the term is "alien or not fully naturalized" (such as a recent borrowing).

Verb

1. 1
   Of a vehicle: to tend to follow the contours of the ground with its wheels.