A large amount of people crowded into a subway system.
The people are on the subway riding to work.
Just because they are on the subway, doesn't mean they are riding to work.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & into(e1,x4) & n_system(x4) & of(x4,x5) & n_subway(x5) & Theme(e1,x3) & v_crowd(e1) & (x2 = x3) & n_people(x2) & n_amount(x1) & a_large(s1) & Theme(s1,x1))
exists p1 x1 x2 x3.(n_riding(x2) & of(x2,x3) & n_subway(x3) & n_people(x1) & exists p2.(on(x1,x2) & Topic(x2,p2) & exists e1.(Actor(e1,x2) & v_work(e1))))