I think they are talking about coming from Union Ave onto Amtrak property. The 2011 CORA guide has a map on pg BNSF-23 that shows BNSF property and signals. Look for B3. If you are coming (the other direction) from CUS into the wye the signal on the map should be the Canal St signal, the first BNSF signal you will encounter. On the map it is on the right side but it has been replaced with the rest of the BNSF wye signals and has been moved to the left side of the track for better visibility.<br /><br />The 2015 Chicago Terminal Study Guide shows the property division even better. Look at page 7, B-3. Where the dotted line starts going into the wye is BNSF territory. Everything green is CP Lumber so that would all be Amtrak controlled. The 3S signal I believe is the two-headed dwarf before you go into the curve and the last Amtrak signal into the wye.