The historic nomination would not have saved Amtrak’s iconic flipboard sign, which was removed from the center of the station this year, despite public outcry and U.S. Rep Brendan Boyle’s efforts to save it. The nomination for preservation limits the period of historical significance to the years between 1933 and 1955, meaning that “changes that were made after 1955 would not be subject to the same rigorous scrutiny as changes that occurred before then,” said Paul Steinke, executive director of the Preservation Alliance for Greater Philadelphia.