Medvedkine was the director of an extraordinary group of Red Army veterans who, inspired by Dziga Vertov, formed a Cine Train, a studio on wheels that traveled to remote, poorly organized areas of the populace; made satirical films about the conditions they found there, and showed the completed films to enthusiastic spectators, many of whom appeared in the films. In 1972, Chris Marker, himself a uniquely creative cinema-essayist (Letters from Siberia, Sans Soleil), interviewed Medvedkine and intercut materials from the Cine Train. The result is The Train Rolls On, a thoughtful study of one of the cinema's great agitational filmmakers.