Oct 31 (Reuters) - A Spanish court will deliver verdicts on Wednesday in the trial of 28 people charged in connection with the deadliest attack ever linked to al Qaeda in Europe, the Madrid train bombings which killed 191 people on March 11, 2004.

Here is a chronology of events:

March 11, 2004 - Ten bombs kill 191 people and wound around 1,800 in simultaneous explosions in four packed rush hour trains on the Madrid railways.

March 12 - Then-Prime Minister Jose Maria Aznar links Basque separatists ETA to the attacks.

March 14 - A video tape purportedly from al Qaeda says the Islamic militant group bombed the trains in retaliation for Spain's cooperation with U.S. President Bush and his allies.

-- ETA issues a statement denying any role.

-- Spaniards throw out Aznar's centre-right government in a spectacular election upset. Socialist leader Jose Luis Rodriguez Zapatero becomes prime minister in April.

April 2 - A bomb is found on a high-speed rail track connecting Madrid and Seville.

April 3 - Serhane ben Abdelmajid Farkhet, known as The Tunisian and the suspected ringleader, blows himself up with up to six accomplices after police corner them in an apartment.

Nov. 29 - Aznar testifies to a parliamentary commission defending his decision to initially blame ETA.

Dec. 7 - Italy hands over Rabei Osman Sayed Ahmed, a prime suspect in the bombings.

March 11, 2005 - Islamic Commission of Spain issues a religious order declaring Osama bin Laden to have forsaken Islam by backing attacks such as those in Madrid.

June 22 - Parliamentary commission finds the previous government "manipulated and twisted" the bombings to try to win elections.

April 11, 2006 - Prosecuting magistrate Juan Del Olmo orders 29 people, mostly Spanish or Moroccan to stand trial. His report concludes the bombers were inspired, not directed by, al Qaeda.

Feb. 15, 2007 - Lead judge Javier Gomez Bermudez opens the trial. One of the accused is acquitted.

Oct. 31 - Judge due to give verdicts.

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