A large group of people waiting at a train station.
A group of people are at a train station waiting to go home.
A group does not have to be large.  People do not have to be waiting to go home because they are in a train station.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & at(e1,x4) & n_station(x4) & of(x4,x5) & n_train(x5) & Actor(e1,x3) & v_wait(e1) & (x2 = x3) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists p1 x1 x2.(exists e1 p2 x3 x4 x5.(at(x1,x3) & Topic(e1,p2) & Actor(e1,x5) & v_wait(e1) & exists e2 x6.(Theme(e2,x6) & Actor(e2,x5) & v_go(e2) & n_home(x6)) & (x3 = x5) & n_station(x3) & of(x3,x4) & n_train(x4)) & of(x1,x2) & n_people(x2) & n_group(x1))