John I just saw second knee replacement and read back and saw questions about TIU, AIU, etc.
We have one TIU, four power districts, 4 AIUs, 40-50 relays, a ZW-L, and a second TIU and ZW-L, etc for when we resume laying track. If we can help with any of that, please let us know.
We are very interested in your use of microprocessors to control it all. That is beyond us.
Interested in knee replacement because #2 for me is scheduled for 2/14. Do not look forward to it.