This was back when we first went to DCC. I guess no-one thought of it, especially being not only different roads but different countries. He happened to be running on the other side of the layout and me just setting up. No, no-one checks, not even now. Never had it happen again. He's still a club member, but he may have changed scale. We have a purely Queensland group who run Sn3.5 on the HO track. Running sessions are pretty casual. More problem solving knowledge now so would probably pick it up sooner. The most important things to watch for is someone putting a DC only loco on and burning out their motor or bringing their own NCE radio cab and connecting wirelessly wihout getting a unique cab number. That latter, can and has stuffed up the system, requiring a complete reset of it.