Local legends and paranormal mysteries of Pennsylvania--photos included.   Strange creatures and tales of the supernatural thrive in Pennsylvania, from ghostly children who linger by their graves to werewolves that ambush nighttime travelers. Passed down over generations, Keystone State legends and lore provide both thrilling stories and dire warnings.   Phantom trains chug down the now removed rails of the P&LE Railroad line on the Great Allegheny Passage. A wild ape boy is said to roam the Chester swamps, while the weeping Squonk wanders the hemlock-shrouded hills of central Pennsylvania, lamenting his hideousness. On dark nights, the ghosts of Betty Knox and her Union soldier beau still search for each other at Dunbar Creek. Join Thomas White and company as they go in search of the truth behind the legends of supernatural Pennsylvania.