From early on I've desired to have sounds coming from my engine to add to the joy of running it. While I wanted realistic sounding steam engine noises, for the first couple of years I had to satisfy myself with the occasional leaf getting caught between the wheels.  While it was pleasantly reminiscent of a baseball card in my bike spokes, I never really knew when it was going to start or end and it wasn't very prototypical. The Piko starter engine I have doesn't have a lot of room inside for add-ons. Looking around I learned that sound system, batteries, and other things too large to fit inside the engine are often held in converted box cars or the tender that comes with many smaller engines.  My engine has only a small little coal tank so I considered converting the starter kit box car, but I didn't really want to always have a box car on the tourist line. So I decided to buy my first rolling stock to convert and started searching for a tender on eBay. I found one that...