4. Railroad switch (Turnout)

Turnout is a kind of railway track connecting equipment that enables locomotives to move from one track to another track. It is usually laid in a large quantity at a station or marshalling stations. The turnout can give full play to the passing capacity of the line. Even for single track railway, laying turnouts and building a longer branch line than the length of train can make the train run in opposite directions. Turnouts are very important for railway lines operation.