A SHIVE BLOCK WAS CHAINED TO THE TRACK RAIL WHILE A MOTOR PULLED A WIRE ROPE THROUGH IT. AFTER STOPPING THE MOTOR HE STEPPED TOWARDS THE SHIEVE BLOCK TO REHOOK IT WHEN SUDDENLY THE MOTORMAN MOVED THE MOTOR. THE CHAIN HOLDING THE SHEAVE BLOCK BROKE AND STRUCK HIM ON THE SIDE OF HIS RIGHT FOOT FRACTURING HIS 5TH TOE. THIS IS TO REPORT MEDICAL TREATMENT ONLY.