What you are saying, isn't overheated, real bearing as the cause of the derailment. but that is not the cemented, you are not saying that we know for sure that is what caused it, so how close are we to finding the actual cause? t is what caused the derailment. but -- >> you are sure about that? >> yes. but will lead to the overheated real bearing, we'll bearing, and why it wasn't detected earlier and what could have been done to detected earlier, what maintenance practices, what inspection practices, does no forks other carry out, we have a lot of questions. we have to figure out how we got th...