(rail transport) The provision of double track, usually as a conversion from single track.

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

(rail transport) Provision of four running lines on a stretch of railway track, usually two in each direction.

plural of tracking stock

An indication of how an insulating material withstands certain loads on its surface or how resistant a material is to environmental influences.

present participle of fast track

(Internet) The use of code associated with a single pixel tag (invisible to the user) to monitor the activity of the user, especially his use of advertisements

plural of tracking shot

plural of issue tracking system

(computing) A software program that manages and maintains lists of issues, as organization need it.