May 9 (Reuters) - Activist hedge fund Ancora Holdings has secured enough support from Norfolk Southern shareholders to win some seats on the U.S. railway operator's board of directors, people familiar with the matter said on Thursday.

Investor votes are still being counted ahead of Norfolk Southern's annual meeting of shareholders on Thursday, and the final number of board seats that Ancora will get has not yet been determined, the sources said.

Ancora has nominated 7 candidates to Norfolk Southern's 13-member board.

The sources requested anonymity ahead of an official announcement. Norfolk Southern and Ancora were not immediately available for comment. (Reporting by Svea Herbst-Bayliss Editing by Greg Roumeliotis)