This week marks exactly 55 years since the construction of Prague’s Metro began, although at the time, the plan envisaged just building a tunnel for an underground tramway. The Metro went into service eight years later, in May 1974. The first underground train with three carriages ran between nine stations on line C. When construction works started on January 7, 1966, the workers had no idea that they were laying foundations for the city’s future Metro system. The original plan envisaged regular trams running on ordinary tram lines. It was only during the construction process that the government decided to build an underground rail network instead.