Two rail workers have been arrested on suspicion of manslaughter in connection with a fatal rail crash in Cumbria.
Some carriages rolled down the embankment in the crash
An 84-year-old woman was killed and 22 people injured when the London to Glasgow Virgin train derailed at Grayrigg in February.
British Transport Police arrested two Network Rail employees, aged 60 and 64, both from the Tebay area.
Three months ago, a 46-year-old Network Rail worker was arrested. He has been bailed until March 2008.
A British Transport Police spokesman said on Thursday: "The 64-year-old man has been released on police bail pending further inquiries.
"The 60-year-old man is currently in custody.
"Both men are Network Rail employees. No further information will be released this evening."
Margaret Masson, from Glasgow, died in the crash on 23 February.
An initial report by the Rail Accident Investigation Branch (RAIB) blamed a faulty set of points for the crash.
A later report by Network Rail, released in September, found systematic failures in track patrolling and management.