The engineers are hoping to spot nascent mechanical problems on long-distance train lines run by First ScotRail, a Scottish train operator.

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Svyazinvest was originally conceived both as a holding company for the state's interests in 86 local telephone firms across Russia and as a competitor for Rostelecom, a state-run near-monopoly in long-distance and international telephony.

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The four-engine Yun-20, or Transport-20, is a huge, multi-function airfreighter that can perform various long distance air transport tasks targeting cargo and passengers, the state-run Xinhua News Agency said.

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Mo Farah, Britain's double long-distance champion at the London Games, said he was comfortable with security planning as he prepares to run a half marathon.

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