A federal board has ruled freight rail company CSX must share previously unseen traffic data with Amtrak as the two move toward mediation over the future of the proposed Gulf Coast train route.

The Surface Transportation Board’s ruling came Friday and calls for CSX to grant Amtrak access to materials the freight company had designated as “highly confidential.” Amtrak needs that information to create traffic studies to show the impacts a proposed passenger train could have on the route.

The board is asking all parties – including Amtrak and CSX – to file traffic studies as evidence and ordered them to meet with a mediator.