For a long time metro resisted advances of digital advertising. Underground platforms were decorated with small and large posters, inside metro cars all space was covered with colorful leaflets. In an attempt to increase advertising revenue even entire trains are sometimes wrapped in advertising posters turning the train into a gigantic advertising billboard. But digital advertising was not allowed underground for a long time. No fortress can last that long. Mass transit means a lot of potential clients and video is the most effective way of selling goods and services.
First attempts to install digital advertising in metro started from outside. In 2005, New York Metropolitan Transportation Authority allowed to place a network of 10 mm SMD-based LED screens (manufactured by a well-known British company Lighthouse) over entrances to subway stations in downtown New York. At that time the project was ambitions and enormously expensive. Moreover, SMD was as yet an immature technology. A few years later it became evident that the project was a mistake; it was strategically wrong to launch it at that time.
Digital advertising in metro wins over the new space surprisingly fast. Today nobody wants to be left behind. Even Moscow metro authorities finally decided to experiment and install advertising displays in the platforms (operated by “Olimp” advertising company). The network turned out to be primitive but it’s still better than nothing.