| AccommodationCategory | Accommodations and ancillary services offered on a train.Accommodations and services offered on a train. |
 ClassCodes | The class of inventory controlled services available.Defines a specific code representing the availability of one specific class of service. Such class of service may represent First class, reserved seats, sleeper accommodations, etc. |
| OperatorPref | Describes any preferences in terms of the company operating the train service. Preference may reflect inclusion or exclusion. |
| RailAmenities | Passenger preferred amenities for qualifying the availability request, such as WiFi.Defines preferred rail amenities, including an amenity code, quantity and/or an associated preference level. |
| TransportModes | Describes any preferences in terms of the transporation that may be used in the itinerary. For example, some journies may require that a bus be used to connect between two locations. Preference may reflect inclusion or exclusion. |