WASHINGTON — The Royal Shakespeare Co.’s next visit to the Kennedy Center will feature Vanessa Redgrave, who returns to the RSC after 40 years to perform the title role in Euripides’ “Hecuba.”The production debuts at the RSC’s Stratford-upon-Avon home next February before transferring to London in the spring. It will play the Kennedy Center’s Eisenhower Theater May 21-June 12 as part of the RSC’s 2005 season here. Redgrave’s last performance with the company was as Imogen in “Cymbeline” in 1962. RSC Associate director Laurence Boswell will stage the tragedy of Hecuba, queen of Troy, and her family during the Trojan wars. Laurence previously directed the play at the Gate Theater in 1992, when he was artistic director there.