EE stated he was knocking the lugs loose from the track rails while retreating the track off the #2 section. During the course of the process ee reported pain in his lower back. This incident became a lost time inj on 3/7/14 when the ee missed work associated with the inj. A sought med treatment on 8th was diagnosed with a strain. EE missed 4 days and retuned on the 12th.