The story so far: there are 'swap' agreements between Santander Totta and nine of Portugal's publically owned transport companies which in 2013, following guidelines issued by the Ministry of Finance, stopped paying interest due on the loans due to the rapidly escalating sums due.
On April 12th this year, the government and Banco Santander Totta announced that they had reached an agreement which halted the lengthy litigation on the swaps contracts, complex financial loan deals where the borrower pays more if interest rates drop.