The photo was taken near Park Square roundabout and close to the Sheffield Station stop.
It apparently shows a silver Ford Fiesta marooned on the tram tracks on the tram-only bridge.
UPDATE: Stagecoach Supertram has confirmed the incident and has announced delays on Blue and Yellow routes.
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A spokesman said: "Due to a vehicle blocking the track towards Halfway, we are currently running with delays on both blue and yellow routes"
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