A crowd of people are standing on a train platform are unconcerned as a train passes them by.
A crowd of people are waiting for the train.
Just because there are people on the train platform, it does not mean they are waiting for the train. Furthermore, their lack of concern with the train suggests they are not waiting for it.
exists e1 p1 s1 x1 x2 x3 x4 x5.(on(e1,x3) & exists e2 s2 x6.(a_by(s2) & Manner(e2,s2) & Theme(e2,x1) & Actor(e2,x6) & v_pass(e2) & n_train(x6)) & n_thing(x1) & as(s1,p1) & Theme(s1,x5) & a_unconcerned(s1) & (x3 = x5) & n_platform(x3) & of(x3,x4) & n_train(x4) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3.(n_train(x3) & for(e1,x3) & Actor(e1,x1) & v_wait(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))