‘Most beautiful and cheapest’ metro line opens in Sofia
https://www.railwaygazette.com/operations-and-services/most-beautiful-and-cheapest-metro-line-opens-in-sofia/57242.article
One of the weakest points of subway is that passengers cannot see landscape from train. So, in order not to let them bored, it would be important to build stations with outstanding design.
Sofia Metro Line M3 seems to understand how to create outstanding design in the stations.
