An account carried by one Futures Commission Merchant, the carrying FCM, for another Futures Commission Merchant, the originating FCM, in which the transactions of two or more persons, who are customers of the originating FCM, are combined and carried by the carrying FCM. Omnibus account titles must clearly show that the funds and trades therein belong to customers of the originating FCM. An originating broker must use an omnibus account to execute or clear trades for customers at a particular exchange where it does not have trading or clearing privileges. On Track (or Track Country Station) (1) A type of deferred delivery in which the price is set f.o.b. seller's location, and the buyer agrees to pay freight costs to his destination; (2) commodities loaded in railroad cars on tracks.
Source: Commodity Futures Trading Commission