Definition of tramlines:
(n) :
(rail transport) The rails that a tram runs on.
(n) :
(tennis, British) Either of the two pairs of sidelines marked on a tennis court which mark the outside of the singles and doubles playing areas.
(n) :
(medicine) A mark or bruise having the shape of two parallel lines.
(v) :
(intransitive, road transport) Of a vehicle: to tend to follow the contours of the ground with its wheels.
(n) :
(film) A scratch on a film, usually vertical, that extends through multiple frames.
(n) :
(lexicography, Oxford English Dictionary jargon) 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).