A large group of people getting on a train.
A group of people are boarding a bus.
A train and a bus are two completely different vehicles.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & on(e1,x4) & n_train(x4) & Actor(e1,x3) & v_get(e1) & (x2 = x3) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_board(e1) & n_bus(x3) & of(x1,x2) & n_people(x2) & n_group(x1))