I have two types of Duplo electrical trains. The Intelli train and the regular train (e.g. 3772). They need some repair and servicing, but are hard to open. I found a short description opening the Intelli train, but did not yet manage to get it open without damaging it.
- pair of pliers
- duct tape
- two small pieces of cardboard
- screwdriver bit (flat)
Prepare the pliers by taping the two pieces of cardboard to protect the pliers beak. This prevents the pliers from damaging the train.
Now place the screwdriver bit exactly on the visible yellow tabs before applying pressure with the pliers.
Now carefully apply pressure to the bit using the pliers.
Sadly the Intelli train does not have the large black bumpers so, this method does not work on that type of train. I need to find another approach for that one 😉
Good luck!