tramline

The rails that a tram runs on.

Either of the two pairs of sidelines marked on a tennis court which mark the outside of the singles and doubles playing areas.

A scratch on a film, usually vertical, that extends through multiple frames.

A mark or bruise having the shape of two parallel lines.

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).

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