As an increasingly large proportion of the population is concentrated in cities, metro systems have become a crucially important mobility factor. Passenger numbers worldwide have increased by approximately 8.7 million in the last six years. According to current estimates, the global metro rail network will be expanded by 1,400 km per year. Doka is involved as a formwork expert on a large number of metro projects all over the world, providing the best solutions for a variety of construction methods.