Ed,
Here are two pictures of the G-Signal running on automatic as the train approaches the interlock. As the Big Boy approaches and hits the isolated rail, the G-Signal changes to Red. Once the train is off the isolated rail section, the automatic feature causes the G-Signal to turn yellow then green.
The isolated rail starts just ahead of where the Big Boy Cab passes the G-Signal. The section of isolated rail is only 30" approximately, until the isolated rail for the Target Signals for the Bridge Right-of-way start.
There are two isolated rail sections for the Bridge Traffic on either side of the interlock 90-degree cross-over. They are about 30" and 28" on each side of the cross over.
The track to the left is also wired this way for its G-Signal that is connected from that track's Target Signal to the G-Signal on its track.
Sincerely, John Rowlen
