A CO-WORKER WAS BRINGING SUPPLIES FROM SURFACE TO SECTION #2. HE HAD CALLED FOR TRACK CLEARANCE. EE LEFT THE #1 SECTION WITH LOCOMOTIVE & A LOAD OF GARBAGE BUT FAILED TO OBTAIN CLEARANCE FROM SECTION TO SURFACE. THE 2 LOCOMOTIVES COLLIDED IN A SWAG ON #4 BELT. EE WAS TAKEN TO HOSPITAL, TREATED & RELEASED WITH ONE WEEK OFF.