Francine,
Thanks for the clarification. Sorry for my misunderstanding. One thing I recommend as soon as engines with electronics in them get used is installing fast-acting spike (spark) and short protection everywhere on that layout. That's even true without a command system in play, just electronic reverse units is reason enough. I used to recommend Scott's Odds 'n Ends DTK-4Z's for spike protection and a bank of 7A fast-blow fuses for short circuit protection. I used them on my layout and that combination saved the day -- never an electronics failure even with personal and club event TMCC, Legacy, and DCC use. However, SOE is out of business and there's (finally) something fast-acting (critical), resettable, and better that FA fuses -- DCC Specialities PSX-AC units. Two were installed on one of the club layouts that I run on and they are great. You and NPS might want to consider them. Could prevent burn-outs and other electronics harm.
Dave