When the capacity of a double-track railway is in excess of requirements, the two tracks may be reduced to one. In some countries this is called singling. Notable examples of this in the United Kingdom occurred on the Oxford-Worcester-Hereford, Princes Risborough-Banbury and Salisbury-Exeter main lines during the 1970s and 1980s. In all these cases, increases in traffic from the late 1990s have led to the partial reinstatement of double track. In New Zealand the Melling Line was "singled" to the Western Hutt Railway Station in Lower Hutt in 1958 after it became a branch line rather than part of the main Hutt Valley Line.