Only four international rail lines currently carry passengers between the U.S. and Canada. At Vancouver's Pacific Central Station, passengers are required to pass through U.S. pre-clearance facilities and pass their baggage through an X-ray machine before being allowed to board the Seattle-bound Amtrak Cascades train, which makes no further stops before crossing the border. Pre-clearance facilities are not available for the popular Adirondack (New York City to Montreal) or Maple Leaf (New York City to Toronto) trains, since these lines have stops between Montreal or Toronto and the border.