I asked in my post but none of my many German friends replied.

Those loitering tourists are always making us miss trains but I ask because I had some German pensioners loudly complaining that people should use the stairs if they want to walk and was flabberghasted. Then looked for signs, if they needed any, and I think there are little pictorials but wtf it is only logical, nobody I know doesn*t know. They might do it if midtalk or assholes but everyone knows you walk on the left. So strange to think it*s not common enough in Germany for staid older couples to know! :)