TNT equivalent
On 27 November 2009 four cars from train No. 166 derailed while travelling between Moscow and St. Petersburg. The derailment was a terrorist act caused by the detonation of of TNT equivalent. At least 27 people were killed and 96 injured. In a secondary explosion on 28 November, directed at investigators, Alexander Bastrykin, head of the Investigative Committee, was injured and hospitalised.