.... Ivan Akinfov, the railroad watchman, found you...... Whom did Akinfov find and when did he find the person

From the text:

"Denis Grigoryev!" the magistrate begins. "Come nearer, and answer my questions. On the seventh of this July the railway watchman, Ivan Semyonovitch Akinfov, going along the line in the morning, found you at the hundred-and-forty-first mile engaged in unscrewing a nut by which the rails are made fast to the sleepers.