(automotive) A paved track on which road vehicles can be tested. / (rail transport) A railway track for the purpose of testing trains.

(rail transport, slang, US) A person hit by a train after jumping or falling in front of it.

(rail transport) A diagram of the track layout at a particular place.

(rail transport) Of a section of railway line, provided with track circuits.

(sports) A track having a soft springy rubber surface and lane markings, designed for exercising and running races. / A track for exercising animals, especially racehorses.

(finance) A specialized equity offering issued by a company that is based on the operations of a wholly-owned subsidiary of a diversified firm.

(Britain) pursuing two objectives by employing two simultaneous processes / (rail transport) Synonym of double-track.

(rail transport) Having four running lines, usually two in each direction.

(rail transport) Railway track mounted on a concrete (or asphalt) base, without the use of ballast.

using the wrong general approach to a particular task or problem; pursuing something in an unpromising way