Gloucester single car DMU. The single car 'bubble car' DMUs are an ideal diesel era branch train for small layouts. Following shipping delays due to COVID shutdowns the Gloucester class 122 DMU models are expected to be delivered during Spring 2021. Dapol have confirmed that these models are in a container on the ship Ever Given. Yes, that is the ship that got stuck in the Suez Canal and is currently arrested under marine law. A revised release date will be available once the ship is released.