I just came over this yesterday: turntables and traversers are tagged only on their outer limit. Often you find one piece in it also tagged, often the one showing the track location at the time of a random sattelite image. I would suggest not tagging that piece of track, giving the renderer the freedom to put one at a random place (or even animating one, think of f4map). So one would need to put the information like electrification somewhere. I suggest adding those tags (electrification, gauge) directly to the traverser or turntable (outline).
Eike