OBS_VALUE: The four largest rail freight operators in the UK are DB Cargo UK, Freightliner, GB Rail freight and Direct Rail Services (DRS). Of all these, DRS is a wholly-owned subsidiary of the state-owned Nuclear Decommissioning Authority. ScotRail, Welsh Railways, the East Coast mainline, Transpennine, Northern, Southeastern and the Caledonian Sleeper are also all in public ownership. 