City workers are doing maintenance on a train track.
City workers just fixed a broken rail.
Not all train track maintenance requires repairing broken rails.
exists e1 x1 x2 x3 x4 x5.(on(e1,x4) & n_track(x4) & of(x4,x5) & n_train(x5) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_maintenance(x3) & n_worker(x1) & (x1 = x2) & ne_geo_city(x2))
exists e1 s1 s2 x1 x2 x3.(a_just(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_fix(e1) & n_rail(x3) & a_broken(s1) & Theme(s1,x3) & n_worker(x1) & (x1 = x2) & ne_geo_city(x2))