Not sure this would count as cool or not ...
1. Three O27 uncoupling tracks, and one uncoupling FT kit
2. Marx railroad crossing signal (I'm digging the Marx stuff for sure) ...
3. A second Marx Switch Tower (I'm planning on putting them at opposite ends and lighting them with Woodland Scenic LED nano lights).
ETA #4. A few amber and white flashing Just Plug LED nano lights off of eBay.