Here is my score card to date. 95% of my motive power now has supercap battery replacements, BCRs, BCR2s, Nimh 9v rechargeable batteries and 2.4V rechargeable Nimh batteries. I made one flub-up so far by connecting the (+) of a battery replacement pack of two 2.5V 3F caps to the (+) of the circuit boards. So my Rail King GG1 makes sounds, it lights up, but it does not obey the DCS handheld controller. I changed the polarity so the cap (-) goes to the board (+). Is my GG1 fatally damaged?