I'm working on my block controller now. It will be able to monitor and control up to 14 blocks. As a trailing train reaches the block behind the lead train, the voltage on that block would be reduced to about 6VAC so the trailing train decelerates to a crawl.
It occurred to me that this will also effect car lighting. I'm looking at designing a regulator module using a super capacitor to maintain constant voltage (or current) to lights for several seconds with up to a 50mA 12V LED load. That will also eliminate any flickering as cars travel around the loop.
There is an inexpensive buck-boost regulator available from China that uses the XL6009, but I understand its output can go overvoltage when the input voltage falls below the XL6009 5.0V minimum spec. Comments?