The separation of the rail network from train operating companies, by contrast, has not.

ECONOMIST: There are problems with Ofcom's elegant solution for BT

More recently, safety, and economic and investment issues created by vertical separation, have caused huge problems on Britain's rail network and there is increasing disenchantment with the industry structure in place.

ECONOMIST: Language barriers

How can we maintain a separation of duties, so that security policy definition is separate from traditional network operations?

FORBES: Repackage or Reimagine? Virtualization and the Potential for a New Security Regime