Kim Stanley Robinson wrote a book, 2312, which featured an equatorial city on Mercury mounted on massive concrete rails. The expansion of the concrete rails on

Kim Stanley Robinson wrote a book, 2312, which featured an equatorial city on Mercury mounted on massive concrete rails. The expansion of the concrete rails on the day side permanently keeps the city in the planets relatively pleasant pre-dawn zone. The city only needed to move at walking pace to stay ahead of the sunrise. IIRC one of the major mercurian industries was maintaining massive solar reflectors that were used to boost light going to specific asteroid greenhouses.