THE INJURED WAS BUILDING A BRATTICE ON #1 UNIT. HE DID NOT HAVE THE CURTAIN DOWN AND NO FLAG WAS HANGING TO CURTAIN CAR DRIVER. A RAM CAR RAN THRU CURTAIN, HIT THE TRAILER OF BLOCK, HITTING THE INJURED ON LEFT LEG. THE CAR DRIVER DID SOUND HORN AND FLASH HIS LIGHT BEFORE GOING THRU CURTAIN.