A man dressed in blue standing on the back of a train.
A man is riding a train.
If a man is standing on the back of a train, this implies that he is riding a train.
exists e1 s1 x1 x2 x3 x4 x5.(n_back(x4) & a_topic(x1) & on(e1,x4) & of(x4,x5) & n_train(x5) & in(e1,x3) & n_standing(x3) & a_blue(s1) & Theme(s1,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_train(x2) & n_man(x1))