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Im not saying it cant be done.  The main creator of different cases is diverging route into signaled or not signaled track, and crossing of a signaled track.  Thats three right there, add no diverging route (4), and trailing point versions of different divering routes.   You then need to look at occupancy status on the opposite line (assuming single direction of travel, RH running).  We discovered 8 unique signaling cases.  This created 11 columns on the truth table (track configuration plus occupancy).  Likely this could be paired down somewhat because a trailing point is a trailing point no matter what the track connected to it is doing.  This resulted each column needs every possible combination that could be seen, and IMO the correct way to do this is to create a line for each posible combination of 1 and 0 in each column, resulting in over a couple of hundred lines of code.  If you go the other way, only putting in the actual cases, you might end up with an undefined configuration if you forget something.  We are just doing ABS for the the moment, treating each main line as a single track in each direction.  I was hoping for more (APB or CTC bi-directional), but the cost was going to be too high. [quote user="rrinker"]Also more for things liek APB, for CTC you still need a connection back to the dispatcher console, so might as well use Loconet or CMRI or LCC and put the logic in the controlling computer.[/quote] Yep,  My thought on that is to use the Arduinos as daughter cards to the LCC nodes if it ever comes to that.
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