Hello everyone.
I purchased a 6940 Union Pacific item number 65153 DCC Sound Value On Board.
Using a digital Intellibox II.
It all works fine except when quickened, as well as some voltage, the locomotive suddenly block. I read that we must be careful not to give too much power when it is used in analog mode.
But I use it in digital.
Should I adjust some CV?
  Someone could help me?
Thank you in advance.

Luca Vianini