David Johnson <trainman@ozemail.com.au> wrote in message 39116EE4.1ACF5FB7@ozemail.com.au">news:39116EE4.1ACF5FB7@ozemail.com.au... > > Then they also have "poor man's bi-directional" which has only one signal in the > wrong running direction (so there can be no following movements). > This is known as "Simplified Bidrectional " (SIMBID) and is not meant for timetabled moves.