A turnout is a line connection device that allows locomotives and vehicles to transfer from one track to another. It is usually laid in large quantities at stations and marshaling yards. Turnout rails are an important part of the railway track structure. With turnouts, the fast passing capacity of the line can be fully utilized. At present, more than 95% of domestic turnout factories use high-speed turnout rails and online heat-treated turnout rails produced by BaoSteel .