POLICE KEEP A CLOSE EYE ON ALL BUT TWO OF THE PASSENGERS, AND ARE BELIEVED TO BE HOLDING THE TRAIN'S THREE MAN CREW PRISONER AT A SECRET DETENTION SITE IN THE SOUTH OF ITALY. GOVERNMENT DENIALS FLY IN THE FACE OF WELL DOCUMENTED FACTS. WHEN F626 VANISHED IN 1950, THE STORY APPEARED IN ALMOST EVERY ITALIAN NEWSPAPER.