Background With an annual ridership of its subway system at 2.46 billion and growing rapidly, the government in Beijing recognized that the system required expansion to meet commuters’ needs. The government knew that enlarging its subway system would reduce traffic congestion and lengthy commuting times, as well as decrease fuel consumption and air pollution. A new subway line was designed to be Beijing’s fastest (average speed of 100 km/h), longest (41.2 km from the east to west of the city) and provide the largest passenger carrying capacity (64 trains with eight cars each transporting 2,000 passengers every three minutes). To ensure the line’s safety and reliability, the government required a state-of- the-art power distribution system from a supplier that coul

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