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Motors, switches, light barriers and LEDs: The largest model railway system in the world is packed with sophisticated technology that needs to be checked and maintained regularly. That's why there's always something for the operators to do in Hamburg's Speicherstadt. In this episode, a leak in the 30,000-litre water tank keeps the tinkerers busy. While the team tries to repair the damage, founder Gerrit Braun is pushing ahead with the construction of a new attraction. A Formula 1 track with hand-made racing cars is being built in the "Miniature Wonderland".