The EE was throwing a rail track switch,the end of the handle made contact below his rt.knee. The EE cont'd to work full duty and on 10/02/12 an MRI revealed a meniscus tear to his knee. Working 39yrs.in a coal mine, chronic overuse & the attached Dr. letter stating that repetitive trauma contributed to the knee tear.The EE's 1st day away from work was 11/1/12.