As part of our run of Christmas episodes last year, we listened to one of the Suspense versions of “The Signal-Man,” based on Charles Dickens’ other famous ghost story. The Signal-Man has been adapted by so many different series, we’re revisiting the tale, this time listening to the Columbia Workshop version of the story of an isolated rail worker whose strange visions foretell terrible tragedies. Is the Signal-Man suffering delusions or catching glimpses of the future? How will this version compare to last year’s? Are your pets technically haunting you? Listen for yourself and find out!