People milling around in a subway station before the train comes through.
In the sub station people stand around waiting for the train.
"People stand around waiting for the train" is a rephrasing of "people milling around in a subway station."
exists e1 p1 p2 x1 x2 x3 x4 x5.(n_train(x5) & a_topic(x1) & exists e2 s2.(a_through(s2) & Manner(e2,s2) & Actor(e2,x5) & v_come(e2)) & before(e1,p2) & in(e1,x3) & n_station(x3) & of(x3,x4) & n_subway(x4) & exists s1.(Theme(s1,x2) & a_around(s1)) & Topic(e1,p1) & Actor(e1,x2) & v_mill(e1) & (x1 = x2) & n_people(x1))
exists e2 e1 x1 x2 x3 x4 x5 x6.(n_train(x6) & n_people(x2) & of(x2,x4) & n_station(x4) & of(x2,x3) & n_sub(x3) & in(x1,x2) & around(e1,e2) & for(e2,x6) & Actor(e2,x5) & v_wait(e2) & Actor(e1,x5) & v_stand(e1) & (x2 = x5) & n_event(x1))