In Disney world what monorail colors are retired?

Monorails can be rear-ended and rear-end other monorails... so people who are not trained as Monorail Pilots or other Disney employees shouldn't be on there in the case of an accident. I don't think Disney will allow people in the cockpit ever again. I think the risk and liability are too great for Disney to bear. Although, you can still apparently ride up front at Disneyland. I guess time will tell, but it's been four years. Pink and Purple were retired due to the accident, but so far, no others have been retired. They have been wrapping monorails in different "skins" to promote some of Disney's movie ventures, such as Tron (the "Tron-orail"), the Avengers (the "Avengerail"), and Iron Man 3 ("The Iron-Rail?") and Monsters University, ("The Monsterail.") Those are my stupid nicknames for them, but nonetheless.