Pictures attached to make sense out of the words.
AS you do an upgrade of a steam locomotive, watch out for the pin extensions on the Engine side of the harness. In manufacture, some kits have the pins extending upward too far. If the wires on the harness connector are then compressed when putting the cab on after the upgrade is complete a SHORT can occur blowing out the PS2 board(s).
This just happened to me on a KLINE Mikado conversion. Space under engineer area was too tight and as I tightened down the cab screws as the final step, I forced the roller wire into the pin below. Never thought about it. I checked two other kits and neither have this extended pin manufacturing defect.
In the pictures, you can see that I ground the pins down and then used on of my favorite insulating tools, DUCT SEAL, to protect wires and pins further.
Boards will now go to George to see if he can salvage them.