In the first episode, it's the start of the Summer, and the Metro staff brace themselves for one of the busiest days of the year.
The Spice Girls are in town as part of their comeback world tour, meaning 50,000 fans from far and wide will be descending on Sunderland, putting additional pressure on the Metro's already stretched resources.
Every one of the Metro's ageing fleet of trains will be needed to cope with the higher than usual number of passengers – meaning that planning has to be spot on so the system doesn't grind to a halt.
The drama unfolds across the day as head of operations Wayne Dixon spots a potential problem with an overhead line. Meanwhile, there's an anxious call to the Metro control room - two Spice Girl fans have lost their tickets and it looks like they won't be getting to the concert of a lifetime.
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