A Refueling Station
produces Tiberium cores
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Each Refueling Station is an elevator to the surface from an underground structure. A piston can be seen pushing a newly arrived crate off the elevator, onto a ramp and out of the tower. The station appears to be able to rotate 360° allowing it to deposit crates all around the station.
They produce both green and blue Tiberium cores, though blue cores can only be seen by Offense Class players.