Both sides of the Honolulu rail project argument are claiming victory Thursday after a U.S. District Court ruling was handed down.

This latest ruling could mean the $5.3 billion rail project may be delayed by months.

Click here to read the entire ruling.

The plaintiffs in this case includes Honolulu mayoral candidate Ben Cayetano, anti-rail advocate Cliff Slater, University of Hawaii law professor Randall Roth, and others.

The plaintiffs claim the city and the Federal Transit Administration violated federal statutes in the process of approving a 20-mile elevated rail project.

The judge sided with the plaintiffs with regard to failure to identify above-ground traditional cultural properties, which include Native Hawaiian iwi, prior to federal approval; failing to consider the Beretania Street Tunnel alternative; and failing to consider whether the project will constructively use Mother Waldron Park.

The court sided with the defendants on all other claims.

The city may have to do a Final Environmental Impact Statement with regard to Mother Waldron Park.