Tough(X) Models with this special rule must accumulate X wounds before being removed as a casualty.
If a model with Tough joins a unit without it then you must remove regular models as casualties before starting to accumulate wounds on the model with Tough.
When a unit with multiple Tough models takes wounds you must accumulate them on a single model until it is killed before starting to accumulate them on another.
Transport(X) This model may transport up to X models. Units embark by moving into contact and may use any action to disembark but only move by 6”. Units may also be deployed within a transport. If a unit is inside a transport when it’s destroyed then it must take a Dangerous Terrain test, is immediately Wavering, and surviving models must be placed within 6” of the transport before it’s removed from play.