Thank you Rob, but I guess my level of electrical knowledge is probably well below any Amish folk. I've never heard of TVS diodes and have yet to find the MTH TIU manual. My power district is a 5' X 7' oval around a tree. I would like to have three separate ovals operated through 1 TIU to run DCS on Proto 3.0 powered units powered by 2 Z1000's and 1 Z500 ( 1 to each oval). I've done 2 the last few years. Are three possible? I just noticed today that I have 2 fixed and 2 variable inputs. I've been using fixed for the Z units. How do I run the 3rd? The issues I've had is that a derailed train would pop a breaker on one of the Z power units and a brand new MTH CTA subway set just stopped after less than 5 runs around the tannenbaum (out of warranty $330) Many years ago I had a Proto Sound MTH E8 ABA unit snap, crackle, and pop! I had it repaired and changed to a 2.0 with no issues. I just got another $1000+ MTH set up, and want to prevent owning another paperweight. My TIU is level "L" if that matters. If running three trains under a tree require wiring that resembles the cockpit of a 727 with the panels removed, then I'm going back to conventional. Most of my friends drink enough not to appreciate the difference between a first year Lionel Polar Express/1936 AF Zephyr vs. a MTH Premier NYC Hudson. BTW, I'm running O48 Lionel Fastrack due to space limitations. My MTH Premiers can run, but they look goofy/odd/wrong on O48. I just got a MTH Railking Imperial GS-4 SP with all the passenger cars with the happy Christmas Lights figuring this is the last shot due to MTH shutting down. 2020 continues to be a dog with fleas!
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