Workers wearing orange reflective vests walking along train tracks.
Workers on the train tracks are looking for problems.
You can not infer they are looking for problems.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6.(Theme(e2,x2) & Actor(e2,x1) & v_wear(e2) & along(e1,x5) & n_track(x5) & of(x5,x6) & n_train(x6) & Actor(e1,x4) & v_walk(e1) & (x2 = x4) & n_vest(x2) & a_reflective(s1) & Theme(s1,x2) & of(x2,x3) & n_orange(x3) & n_worker(x1))
exists e1 x1 x2 x3 x4.(n_track(x2) & of(x2,x3) & n_train(x3) & for(e1,x4) & n_problem(x4) & Actor(e1,x1) & v_look(e1) & on(x1,x2) & n_worker(x1))