UK Rail Accident Investigation Branch Reports on Derailment Accident - Is Fatigue a Root Cause?
Did fatigue cause this derailment?

See this report:
http://www.raib.gov.uk/cms_resources.cfm?file=/091110_R282009_East%20Somerset%20Junction.pdf
to find out what the UK Rail Accident Investigation Branch has to say and to see their recommended corrective actions.

