A man is loaded on to a train in a wheelchair.
A man is pushed onto the train by a train assistant.
We don't know that man is pushed by a train assistant
exists e1 x1 x2 x3.(r_on(e1) & to(e1,x2) & in(x2,x3) & n_wheelchair(x3) & n_train(x2) & Theme(e1,x1) & v_load(e1) & n_man(x1))
exists e1 x1 x2 x3.(Actor(e1,x3) & n_assistant(x3) & of(x3,x2) & n_train(x2) & n_train(x2) & onto(e1,x2) & Theme(e1,x1) & v_push(e1) & n_man(x1))