Hamburg's Hochbahn uses massive car wash to keep U-Bahns spotless

In Hamburg, the Hochbahn operates an impressive, large-scale washing facility designed to keep its subway trains gleaming. Located within the U-Bahn workshop in Farmsen, this XXL car wash is essential for maintaining the fleet's appearance after periods of urban travel.

After spending 28 days navigating the city's extensive network, trains are brought in for a thorough cleaning. The process involves a 40-minute wash cycle, where approximately 30 large, red rotating brushes work to remove accumulated dirt. A wash wagon driver assesses the level of grime to determine whether a "normal" or "intensive" wash is required.

Each wash cycle utilizes around 3,500 liters of water. The facility demonstrates a commitment to sustainability by recycling 2,500 liters of this water as greywater. An additional 1,000 liters are drawn from a well, ensuring that potable water is conserved during the cleaning process. The facility employs various specialized brushes, including portal, roof, and side brushes, each designed for specific cleaning tasks.

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So it is not drinking water.