The Interline Settlement System® (ISS) is the only centralized process to negotiate and agree upon the sharing of revenue generated for a movement when two or more railroads are involved in a shipment’s route. ISS is the method by which the rail industry settles interline freight revenues via Electronic Data Interchange (EDI).

Through EDI messaging, the system distributes revenue waybills—including rates and divisions—and provides a mechanism for concurrence prior to settlement, thereby eliminating most post-settlement disputes.

The rules for the ISS are included in the Railway Accounting Rules.

Interline Settlement System® is a registered trademark of Railinc Corp.