Do French protests always follow tram tracks? Otherwise, it seems like you could just use normal wheels.

If I just saw the picture and I knew it was a protest, I’d have figured that these people work for the tram and are protesting the tram company.

Are their tram rails powered? If they are, it could be using that power to cook while moving. I assume they aren’t, at least not the rails but maybe overhead power, but it would be cool.