Zero Energy Transportation is vital to create gravity on MARS

You need a centrifuge to create gravity on MARS.

By using train carriages joined together in a loop, vacuum generation is very cheap because most air is taken up by the carriages. If the carriages run in a circular loop, gravity is created. Zero Energy is required because there is zero loss if magnetic leviation is used and energy recovery is utilised.

There is the inevitable losses but these can be reduced to such a low value that the energy cost is extremely small and can be topped up by solar panels. The low loss also means that the life of these components will be long. There is very little friction to degrade materials at the points of contact.

Creating gravity on MARS is very important in order to allow humans to retain their bone densities and allow babies to be born as normal human babies instead of deformed babies.

So expecting mothers and babies are important to be kept at these centrifuge tunnels. The centrigue tunnels can be kept running as long as possible, stopping only to accept new occupants or to let existing occupants to leave.

To allow unstoppable centrifuge while allowing free access to the carriages will require new inventions.