South Western Railway strike: Why are guards on strike?

Commuters are facing disruption as workers on South Western Railway (SWR) begin a 27-day strike.

It comes after talks between the Rail, Maritime and Transport (RMT) union and SWR over a long-running dispute over guards on trains broke down.

The BBC's Transport Correspondent Paul Clifton explains the background the strikes.

Cameraman: Doug Manning

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