(Hamilton)----Hamilton City Manager Joshua Smith is demanding an explanation for the recent problems with broken down trains blocking city crossings for hours at a time. In his letter to CSX Resident VP for Ohio Rusty Orben, Smith asked for a formal explanation to residents who have been inconvenienced by the incidents. Smith pulled no punches, threatening to take his case to the Public Utilities of Ohio if he isn't satisfied with the rail company's response. There have been five major incidents involving blocked crossings over the last month, mostly effecting residents on the West Side.