Bringing a robot back will be simple enough, they do however run off solar energy and their power storage is small, so once the train is in the void it will only run for a day or two before powering down- it can be charged up on worlds with sunlight.

It also doesn't do much, all it's commands are stored on the main stations on Nion, without them the robot mostly spins around in circles and crashes into walls. It beeps all the time and flashes warning lights.