Someone in red stands dangerously on some railroad tracks.
A person is on the railroad tracks.
A person is someone.  On the railroad tracks is a rephrasing stands dangerously on.
exists s1 x1 x2 x3 x4.(a_topic(x1) & n_dangerously(x1) & on(x1,x3) & n_track(x3) & of(x3,x4) & n_railroad(x4) & in(x1,x2) & n_stand(x2) & a_red(s1) & Theme(s1,x2) & n_person(x1))
exists p1 x1 x2 x3.(n_track(x2) & of(x2,x3) & n_railroad(x3) & on(x1,x2) & n_person(x1))