The name Duplo was dropped again in favour of Explore in 2002. The new brand name was used to emphasise the relationship between the bricks and the child's learning. Explore introduced four different ways of exploring play: explore being me; explore together; explore imagination and explore logic.
Make sure you're using fresh batteries. We recommend alkaline batteries - they'll give you more playtime. Check if the wheels may be blocked by dust, hair or some other small items. If your train is slow or starts and stops, check that the metal contacts in the battery compartments are working properly.