People gathered to look at trains.
People are gathered to look at trains.
Gathered and are gathered mean the same thing.
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_gather(e1) & exists e2 x2.(at(e2,x2) & n_train(x2) & Actor(e2,x1) & v_look(e2)) & n_people(x1))
exists e1 p1 x1.(Recipient(e1,p1) & Topic(e1,x1) & v_gather(e1) & exists e2 x2.(at(e2,x2) & n_train(x2) & Actor(e2,x1) & v_look(e2)) & n_people(x1))