Germany's main national railway operator, Deutsche Bahn, on Tuesday launched an effort to sell its logistics unit, DB Schenker, as the company seeks to concentrate on its core business at home. Schenker has about 76,600 employees in more than 130 countries and for years generated high profits, helping push Deutsche Bahn into the black. Deutsche Bahn issued an announcement that it's considering selling “the entire share capital of Schenker AG in an open, transparent and nondiscriminatory process” and called for potential bidders to indicate their interest by Jan. 15.