Changes raw ore stack size to 50 so it makes logistical sense to break it down at the mining outpost. If you crush ores at the outpost you can achieve a 8:5 reduction in cargo space. However this requires running multiple cargoes out of the outpost. But you're probably doing something complicated like that anyway!
Only affects the 6 primary Angel Ores.
Try my Heavy Freight mod to improve your train-running experience.