Passengers on the Southeastern service were asked to move off the train or into a separate carriage as an off-duty midwife, nurse and police officer came forward to help.

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The 24th carriage came off the track, derailed, and then set itself right.

BBC: Reading West train derailment caused by poor packing

Some of the bogies (the swivelling device which holds the wheels to the carriage) shear off and several coaches begin to tilt.

BBC: Hatfield: The accident in detail