There is a little boy in a red jacket walking down the railroad tracks and holding a stick.
There is a train on the track.
A boy can't walk on the track if there is a train.
exists e1 e2 p1 s1 x1 x2 x3 x4.(n_track(x2) & of(x2,x3) & n_railroad(x3) & for(p1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_hold(e2) & n_stick(x4) & for(p1,e1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & exists s2 s3 x5 x6.((x1 = x5) & in(x5,x6) & n_jacket(x6) & a_red(s3) & Theme(s3,x6) & n_boy(x5) & a_little(s2) & Theme(s2,x5)))
exists p1 x1 x3.(n_track(x3) & exists x2.((x1 = x2) & on(x2,x3) & n_train(x2)))