Design of Berlin's Train Stations and Train Windows

I found Berlin's train stations to be somewhat fascinating. I do love the design of the Hackescher Markt Station. It opened in 1882 or 1907, according to different sources, but, regardless, I can't help but wonder about the decisions made before the design was approved. What were the arguments between saving money and creating such an ornate and labor-intensive design? What was the prevailing philosophy about architecture at the time, especially regarding buildings serving the public? What were the CEO salaries relative to the cost? Was this station a triumph of beauty over short-term economics? Are there lessons in this architecture that can help us solve the economic problems, the labor problems of today?

Berlin's new Hauptbahnhof is a modern, multi-level architectural beauty. Considering the heavy bombing Berlin endured during WW II, I had to wonder about the large advertisement in the background.

Many of Berlin's U-Bahn (subway) trains sported Brandenburg Gate decals that, from a distance, looked a bit like white lace curtains.