Children in Sofia have the opportunity to experience the thrill of driving a train in the Sofia-Metropolitan's train simulator at the Zemlyane depot. On World Children's Day, kids will also be able to visit the hall with the train carriages to get a closer look at their construction and functions.

Children will also hear interesting facts about how the metro is built and operates. Participation is free of charge, but places are limited, Metropolitan- Sofia said on Facebook. The maximum number of children allowed in a group is 20 and visits will be conducted after prior registration.