Reply Robert Gilchrist of North Grafton, Massachusetts rolled his snowmobile several times on a trail in Colebrook and was seriously injured. (NH Fish and Game) COLEBROOK, NH - NH Fish and Game officers responded to a snowmobile crash on the rail-trail in Colebrook on Thursday evening. Colebrook Police, Fire and Rescue, NH State Police, and the 45th Parallel Ambulance responded to the scene to assist the patient, identified as Robert Gilchrist, 58, of North Grafton, Massachusetts. Gilchrist was transported from the scene to the 45th Parallel Ambulance, which transported him to Upper Connecticut Valley Hospital (UCVH) in Colebrook. Subscribe Due to the serious injuries, a medical helicopter was requested. Healthnet 4 helicopter responded from UVM Medical Center in Burlington, VT