And it should be noted that Berlin is ridiculed in Germany for its horribly broken S-Bahn service. A few years ago, the Federal Railway Authority had to lay up about 3/4 of their trains because they were vastly underserviced. The operator then truncated many of the lines to have enough rolling stock available for servicing the remaining parts. These changes persist until today. (For example, I remember when the S3 used to run until Westkreuz.)