People sitting at tables in a bus or train.
Commuters on a train.
people are commuters.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & (n_bus(x4) | n_train(x4)) & at(e1,x3) & n_table(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_train(x2) & n_commuter(x1))