EMPLOYEE WAS RIDING IN A LOCOMOTIVE PUSHING WAGONS TO THE END OF TRACK OF 7 WEST. THEY PUSHED THE WAGONS OFF THE END OF THE TRACK. HE STRUCK HIS RIBS AGAINST THE OPERATOR'S COMPARTMENT. CAUSE OF INJURY WAS AWARENESS. COMPLIANCE WITH RULES/ REGS A FACTOR. PERSONAL SAFETY EQUIPMENT NOT A FACTOR. MINER PROFICIENCY A FACTOR, MINING EQUIP/ SYSTEM NOT A FACTOR.