A crowd of people are walking along the train tracks on dirt.
People are running along train tracks.
A crowd itself indicates that the number of persons are more and is refered as people.
exists e1 e2 x1 x2 x3 x4 x5.(n_train(x3) & along(e1,x3) & on(e2,x5) & n_dirt(x5) & Actor(e2,x4) & v_track(e2) & (x3 = x4) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3.(along(e1,x2) & n_track(x2) & of(x2,x3) & n_train(x3) & Actor(e1,x1) & v_run(e1) & n_people(x1))