A gathering of people having a festival at a train yard.
People are enjoying a festival of trains.
A gathering at a train yard festival are not necessarily enjoying a festival of trains.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & at(e1,x5) & n_yard(x5) & of(x5,x6) & n_train(x6) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & n_festival(x4) & (x2 = x3) & n_people(x2) & n_gathering(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & of(x2,x3) & n_train(x3) & n_festival(x2) & n_people(x1))