SpaceX will soon be building a rocket engine factory near Waco. The company's CEO Elon Musk announced the plan Saturday. The facility to be built in McGregor will make Raptor Two engines, according to a tweet from Musk. The company already has a research and development testing facility in McGregor where new engines and thrusters are developed and final engines and components are tested. Musk says the new plant will building between 800 and a thousand engines per year and be one of the most advanced rocket engine factories in the world.