Here is Section 6 on the "A" line. There are 3 tracks, 2 Local and 1 express. Each is a block containing a single current detector.
The "B" line has 5 blocks (not shown). Normally I would construct a single board containing 8 current detectors for the entire section. However I have single detectors on a Radio Shack dip perfboard that I used on my previous layout. I have additional additional hardware that I wish to reuse also. So I constructed a triple current detector accessory board with reused parts. There is no controller in this circuit, so there are 6 outputs, 3 for the section 6 controller yet to be built (white labels), and 3 of the same outputs (gray labels) for neighboring sections.
