Train operator on a stopped train.
A train is rushing down the tracks.
First sentence said he stopped the traIn. Second sentence says it is rushing down the tracks.
exists e1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_train(x3) & Theme(e1,x3) & v_stop(e1) & n_operator(x1) & of(x1,x2) & n_train(x2))
exists e1 s1 x1 x2.(n_track(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_rush(e1) & n_train(x1))