People are sitting on a train or subway.
The people are old.
Just because people are sitting in a train does not make them old.
exists e1 x1 x2.(on(e1,x2) & (n_train(x2) | n_subway(x2)) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists s1 x1.(n_people(x1) & Theme(s1,x1) & a_old(s1))