Domino Trains

Probably the most common type of Domino Robot is the toy Domino Train

The Atlasonix Domino Train is a battery operated toy that lays a row of dominos behind it as it moves along the floor. The dominos it uses are smaller than standard dominos, but it still works very well and the kids love it!

There are a few very similar variations on this toy.

There is the transparent train.

KiwiCo also has an interesting TinkerCrate that has a domino