The back of two men's heads riding on a train.
The train is making the back of two mens heads bounce on the head rest
Riding on a train doesn't imply that the men's heads bounce.
exists e1 x1 x2 x3 x4 x5.(n_back(x1) & a_topic(x1) & of(x1,x3) & on(e1,x5) & n_train(x5) & Actor(e1,x4) & v_ride(e1) & (x3 = x4) & n_head(x3) & of(x3,x2) & n_man(x2) & card_eq_2(x2))
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(n_rest(x6) & of(x6,x7) & n_head(x7) & n_back(x3) & n_train(x1) & on(e2,x6) & Theme(e2,x5) & Actor(e2,x1) & v_head(e2) & n_bounce(x5) & Theme(e1,x3) & Actor(e1,x2) & v_make(e1) & of(x3,x4) & n_men(x4) & card_eq_2(x4) & (x1 = x2))