Great article on the Class 31, I'm going to do some of these mods on my one. I thought I'd post some details on putting a stay alive and better speaker in it, as I couldn't find any other posts about this online.   The positive connection to the decoder is easy (Blue wire) but the negative is at the end of one of the small diodes and very hard to solder to without damaging the board. Luckily I traced it back to a better/larger point on the other side of the board. With this connected the loco
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