people on a miniature train.
Little kids on a miniature train.
People can be other than little kids.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_train(x2) & of(x2,x3) & n_miniature(x3) & n_people(x1))
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_train(x2) & of(x2,x3) & n_miniature(x3) & n_kid(x1) & a_little(s1) & Theme(s1,x1))