A large fraction of trains and buses in Europe are already equipped with large full-color monitors. They are primarily used to show trip progress, potential transfers, and basic informative messages. Ads are rare, and are usually static images advertising the transport company's own products.

DB is still a 100% state-owned enterprise; it’s “private” in name only.

Sort of like Singapore Airlines, which is listed but majority-owned by one of Singapore’s sovereign wealth funds.