One of Kyrian's favorite locomotives is the MTH BiPolar.
It's been problematic from time to time, getting it's self lost from the DCS system any time it wandered far from the Electric Shop.
Finally that problem settled down and it mostly knows how to stay connected to the data in the system.
We noticed, as it wheeled around the layout, that any time it passed over turnouts, some parts of it are so low to the rail that it would arc and spark as it made it's way around. Doesn't seem to impact operations at all, but it sure tried to impress everyone with it's fireworks display.
Kyrian commented one evening during running, "Old Sparky is at it again!" and the name stuck.