Hornby HST and NCE control

[Marcyg]

I have a very odd problem with my system. A while back, a friend brought over his Hornby HST (new gen) with TTS chips in. Occasionally, it would trip the system. At first, it seemed to be the same place, when it moved from one power district to another. Then the problem seemed to become random. Never found the cause, and it was only this train that caused it. I have all sorts of configurations on my layout, consists, loco + DVT, high draw locos, old locos etc, but we couldnt replicated the problem with anything else. A couple of weeks ago, I bought my first new gen HST, and guess what, the same issue. It has Hornby chips in it, non TTS, and I havn't had a chance to swap them for something else yet, however, it seems really odd that the same issue has occured, and once again, I can't replicate it with ANY other set up I can think of. The system is an NCE SB5 with Tam Valley boosters and NCE circuit breakers. Has anyone else come across this sort of issue? An odd one I know...