Shorts vs. Loss of Power:
If you are using the RailPro Power module, it is easy to distinguish whether a loco stopped due to a short or whether it lost power (derailment, dirty wheels or track, etc.)
In both cases, the red warning light will show up on the HC-2.
If the Power unit LED stays green, you have a loss of power.
If the Power unit LED turns red, you have a short.