Wow this sound cool... So I'm going to recreate Christopher Priest's mobile city EARTH
"Helward lives in a city called "Earth", which is slowly being winched along at an average speed of 0.1 miles per day (0.16 km per day) on four railroad tracks northward toward an ever-moving, mysterious "optimum". The city, which Helward estimates is 1,500 feet (460 m) long and no more than 200 feet (61 m) high, is not on the planet Earth; the sun is disc shaped, with two spikes extending above and below its center. The city's inhabitants live in the hope of rescue from their lost home world.
Upon reaching adulthood at the age of "650 miles", Helward leaves the crèche in which he has been raised and becomes an apprentice Future Surveyor. His guild surveys the land ahead, choosing the best route. The Track Guild tears up the track south of the city to re-lay in the north. Traction is responsible for moving the city, while the Bridge-Builders overcome terrain obstacles. The Barter Guild recruits labourers ("tooks") from the primitive, poverty-stricken nearby villages they pass, as well as women brought temporarily into the city to help combat the puzzling shortfall of female babies. The Militia provides protection, armed with crossbows, against tooks resentful of the city's hard bargaining and the taking of their women.
Only guildsmen (all male) have access to the outside world and are oath-bound to keep what they know a secret; in fact, most people do not even know the city moves. Helward's wife Victoria becomes somewhat resentful when he is reluctant to answer questions about his work.
The purpose and organisation of the city is laid out in a document written by the founder: Destaine's Directive, with entries dating from 1987 to 2023. Helward reads it, but it does not satisfy his curiosity as to what the optimum is or why the city continually tries to reach it."