OKLAHOMA CITY (AP/Staff) – A federal appeals court has upheld a lower-court ruling to deny a preliminary injunction to stop construction of an oil pipeline running from Oklahoma to refineries along the Gulf Coast. The Keystone XL pipeline would pass through eastern Smith County and other portions of East Texas along the way. The Sierra Club, Clean Energy Future of Oklahoma and the East Texas Sub Regional Planning Commission sued the Army Corps of Engineers for approving construction of the Keystone XL pipeline. They asked for a preliminary injunction to stop TransCanada from constructing the pipeline while the lawsuit went through the court system, but a district court denied the injunction. The 10th Circuit Court of Appeals on Wednesday upheld the district court’s ruling.