Although this is off-topic, and the thread should not go much further, it is none-the-less quite interesting.
MEMS technology is the foundation of the device featured in the link offered by Mr. O'Connor.
Could technology such as this show up in model railway products ?
Perhaps... but I would not go looking for it just yet from your favorite R-T-R manufacturers. :-)
MEMS are not really new either. We were deploying them at Lucent Tech well over ten years ago in complex all-otical switching system products.

But, for those curious folks, here are a couple links regarding MEMS.
http://www.memx.com/
http://en.wikipedia.org/wiki/MEMS
http://www.appliedmaterials.com/mems

Ron dePierre