Planetary engine

Those who desire total conquest of Cybertron rarely want to stop there, instead envisioning the creation of a vast intergalactic imperium with Cybertron as its throne. To further this conquest and enslave the rest of the heavens, many a would-be dictator has attempted to either create or use Cybertron's unfathomably powerful planetary engines that can actually repurpose the world as an unstoppable mobile dreadnaught.

In theory.

Marvel The Transformers comics
Megatron's plans to create the planetary engines were seen as so radical and extreme that most of Cybertronian intellectual society dismissed him as a meaningless kook.

MUX continuity
In 2017, Megatron finally completed his engines, and used them to move Cybertron into orbit around Citctus Minor.