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The battery operated Space Express has cogged wheels and can travel vertically up or upside down on a cogged track.

The teeth of the cogged wheel are usually made the thickest, so as to somewhat equalise the strength of the teeth on the two wheels.

It was about a month after this that I began to find myself pitted against Miss Dean in a struggle for some dimly grasped advantage, with the dice cogged against me.

The railway has a central rail which is cogged, and into this endless cog fits a wheel underneath the engine. 

I cogged the dice for myself, but it was the Destinies who threw them!