<public transport> the unique combination of some or all of origin, destination, route, specific trains, date and time, tariff type, and discount category that uniquely defines what transport service can be/has been purchased by the customer

NOTE 1 to entry: Product in the transport sense is identical to the use of the word in the retail industry, being the unambiguous description of things that can be bought.

NOTE 2 to entry: See also Attributing System.