An article in today's Publico newspaper reports that Portuguese Railways are considering reductions in the two international trains services it operates to Hendaye/Paris and Madrid, namely the Sud Expresso e Lusitânia Express.
Travellers with plans to use these services should maintain a check on this as there is a possibility that the services may be reduced to only a few times as week.
See: http://goo.gl/cLxph (In Portuguese)