While Catskill-area anglers worry about the future of their fishery, some north-central Pennsylvania anglers are already mourning the loss of tens of thousands of trout, bass, and other game fish after a railway accident near the town of Gardeau. Twenty-nine rail cars derailed, including three tank cars carrying sodium hydroxide that ruptured and spilled 47,000 gallons of the liquid into Portage Run, one of the state’s best wild trout streams. The chemical sterilized the entire system, said John Arway with state Fish and Boat Commission. “I don’t think much will be able to tolerate or survive it.”