the two were spruk by a b.a.r.t. train a mile north of the walnut creek b.a.r.t. station. sky 7 was over the accident scene yesterday as local investigators responded, dispatch calls indicate there were six people on that train at it's still unclear who was at the controls. investigators say right now they're piecing together the chain of events that led to the accident. >> my concern coming out here as it is for every investigation is to find out what happened. gather the facts. on scene that's all we'll do, gather the fakes. we'll make the measurements, open every door, and we'll look at every single part of what went on out here and make a determination as to what happened. >> abc 7 news reporter nick smith has more from the investigation today. >> every part of the operation out here records inspections, you name it, we'll be turning over every stone opening every door. >> reporter: officials with the national transportation safety board arrived this afternoon leading the investigation into the death of a b.a.r.t. engineer and contract worker struck and killed by this