People are standing on a train platform waiting for the train.
A bunch of people are at a train station.
people are at a train station can also be said people are at train platform
exists e1 e2 x1 x2 x3.(for(e1,e2) & for(e2,x3) & n_train(x3) & n_train(x3) & Actor(e2,x1) & v_wait(e2) & on(e1,x2) & n_platform(x2) & of(x2,x3) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists p1 x1 x2.(exists x3 x4.(at(x1,x3) & n_station(x3) & of(x3,x4) & n_train(x4)) & of(x1,x2) & n_people(x2) & n_bunch(x1))