North London line then it was switched to . Later, it was cut back to . A tunnel, the Hampstead Heath tunnel, runs under Hampstead between and . The line is double track throughout, with a mix of triple and quadruple track between and . The former North Woolwich branch included a section of single track between Custom House and North Woolwich stations, and the Broad Street branch was at one time formed of quadruple track. During the February–May 2010 blockade, the , and stations were rebuilt to allow the extended East London line to serve Highbury & Islington on fully segregated tracks
Owned-and-operated television stations in the United States order to stay under the ownership cap. In addition, networks may choose to sell off O&Os in smaller markets in order to concentrate on their stations in larger markets, or to give themselves leeway to purchase stations in other growing markets. The following are examples of transactions involving owned-and-operated stations in the United States: The DuMont network found itself in financial trouble in 1954, and decided to sell off its Pittsburgh owned-and-operated station, WDTV (channel 2), which was the only commercial VHF station in what was then a top ten television market in the United States. Westinghouse Electric Corporation bought