While pushing off & away from a rail car EE reports feeling a pop in left wrist. Preliminary x-rays show no fracture however a splint was prescribed as a precaution. Follow-up med. exams may be necessary to rule out fracture. EE was released & continues to work w/restrictions. Update: Further exam revealed ruptured tendon requiring surgery on 2/9/16. EE restricted from work 2 wks.