Everyone in this show is either walking or riding a horse to get around. Now let's assume that everyone in the world developed historical amnesia about steam power. It's stupid, but OK. Where are the f**king bicycles?! Are those not working as well?
... Now we need a way for them to get around. They obviously can't use bicycles with their easy maintenance and lack of a need for fuel. Instead, they should drive around on gas guzzling motor vehicles. It doesn't matter that gasoline has a limited shelf life when we can ride in style on 18 wheelers decorated in metal spikes.