When the new high-speed trains on the Arlanda line rush along at over 200 km/h, they get dusty and caked in insects. Cleaning them might seem easy, but the environmental requirements, the more-than-100-metre length of the trains and the operating voltage of 16,000 volts make it a challenge. Kambre AB, a company specialising in various means of cleaning vehicles, has found a solution that provides both better results and a cleaner environment.