A man is oblivious to the crowds behind him at the Pennsylvania train station.
An oblivious man is in a train station waiting to go home.
A man could be at a train station for many different reasons.  You can't tell from the fact that he is there, that he is waiting to go home.
exists s1 x1 x2 x3 x4 x5.(n_station(x3) & of(x3,x5) & n_train(x5) & (x3 = x4) & ne_geo_pennsylvania(x4) & n_crowd(x2) & at(s1,x3) & to(s1,x2) & behind(x2,x1) & n_male(x1) & Theme(s1,x1) & a_oblivious(s1) & n_man(x1))
exists p1 s1 x1.(exists e1 p2 x2 x3 x4.(in(x1,x2) & Topic(e1,p2) & Actor(e1,x4) & v_wait(e1) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x4) & v_go(e2) & n_home(x5)) & (x2 = x4) & n_station(x2) & of(x2,x3) & n_train(x3)) & n_man(x1) & a_oblivious(s1) & Theme(s1,x1))