Just thought I'd share one of my recent projects I did for a customer. I did a command upgrade for a WBB Train Master, and it got the deluxe lighting treatment.
ERR Cruise Commander, RailSounds Commander, electrocouplers, directional headlights, all part of a pretty standard upgrade.
Then I added a few frills.
Rule-17 lighting and motion controlled cab lighting.
Operating MARS simulator, active only when in motion.
Bi-color directional markers, red/green.