Three workers in fluorescent orange clothing cleaning the subway tracks.
The workers on taking the train right now.
If the workers are cleaning the subway tracks they cannot be taking the train at the same time.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_track(x5) & of(x5,x6) & n_subway(x6) & a_topic(x1) & in(x1,x2) & Theme(e1,x5) & Actor(e1,x4) & v_clean(e1) & (x2 = x4) & n_clothing(x2) & of(x2,x3) & n_orange(x3) & a_fluorescent(s1) & Theme(s1,x2) & n_worker(x1) & card_eq_3(x1))
exists e1 s1 x1 x2 x3.(n_train(x3) & n_worker(x1) & a_topic(x1) & r_right(e1) & a_now(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & (x1 = x2))