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The Ore-Train

Features:
3 Built in Refineries, so you need to return to your base less.
1 Assembler to produce anything needed for sustainment and repairs.
3 Gatling turrets to defend against asteroids or scare off anyone that wants to steal your ore.
1 Medical Bay in the control room.
Gravity Drive
4 Big storage containers and numerous small ones.
Double transport tubes from the drills, to transport away the massive amounts of ore mined.
4 Connectors to unload quickly