Here are the key points:

• A fault in a set of points south of the station caused the derailment

• Track maintenance records, particularly those in relation to the points, have been secured by British Transport Police (BTP)

• A BTP video of the event believed to have been recorded by station cameras will be examined in detail

• There is no evidence so far to support the theory the points had been vandalised or deliberately damaged

• There is also no evidence the signals were at fault or the train badly driven

• The WAGN train was travelling up to 100 mph (161 km/h) and the rear part of the train derailed about 150 metres (492 feet) to the south of the station

  The points in question

• The coach sustained significant external damage but passenger accommodation remained largely intact

• Internal fittings and furniture became detached, and windows shattered

• The driver followed set procedures, placing track circuit clips on adjacent lines to prevent other trains going through the crash site

• The coaches involved in the derailment had been found to stand up well to the high-impact forces generated when they came into contact with the fixed infrastructure of the railway

• The infrastructure at the scene - the railway bridge crossing the road and the station buildings - was found to have withstood the impact well

• The train involved was about four years old and had done just below a million miles (1.61 million kilometres)