The train car, destroyed in the derailment at the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro during morning rush hour on July 15, 2014, at the Park Pobedy station.

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Moscow Mayor Sergei Sobyanin, left, inspects the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro, where a train derailed on July 15, 2014.

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Moscow Mayor Sergei Sobyanin, center left, and Moscow Deputy Mayor for Housing, Utilities and Amenities Pyotr Biryukov, center right, inspect the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro, where a train derailed on July 15, 2014.

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Moscow Mayor Sergei Sobyanin, center, inspects the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro, where a train derailed on July 15, 2014.

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Foreground, from left: Moscow Mayor Sergei Sobyanin and Moscow Deputy Mayor for Housing, Utilities and Amenities Pyotr Biryukov inspect the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro, where a train derailed on July 15, 2014.

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Moscow Mayor Sergei Sobyanin, center, at the Park Pobedy-Slavyansky Bulvar section of the Moscow Metro, where a train derailed on July 15, 2014.

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Flowers brought at the Park Pobedy station of the Moscow Metro to mourn the victims of the accident at the Park Pobedy-Slavyansky Bulvar section, where a train derailed on July 15, 2014.

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Moscow Mayor Sergei Sobyanin lays flowers near the Park Pobedy station of the Moscow Metro to mourn the victims of the accident at the Park Pobedy-Slavyansky Bulvar section, where a train derailed on July 15, 2014.

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Moscow Mayor Sergei Sobyanin, right, lays flowers near the Park Pobedy station of the Moscow Metro to mourn the victims of the accident at the Park Pobedy-Slavyansky Bulvar section, where a train derailed on July 15, 2014.

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