EMPLOYEE WAS PLACING POLYCAPS COVERS ON PALLETS THAT WERE TO BE CARRIED BY TROLLEY CAR TO BE STRETCH WRAPPED. SHE WAS AWARE OF THE TROLLEY CAR COMING DOWN THE TRACK AND ATTEMPTED TO PLACE A P OLYCAP ON BEFORE THE TROLLEY CAR RETURNED. SHE MISTIMED THE TROLLEY AND GOT HER RIGHT LEG CAUGHT BETWEEN THE TROLLEY CAR AND CONVEYER. SHE IS A TEMP EMPLOYEE WITH 2 WEEKS EXPERIENCE IN JOB.