Several Asian people are on a train.
People are riding a train.
People on a train are said to be riding a train.
exists p1 s1 s2 x1.(exists x2.(on(x1,x2) & n_train(x2)) & n_people(x1) & a_asian(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_train(x2) & n_people(x1))