"Alt-Hamburg" is kind of a model train scenery. Most stations and loading bays are too big, several trains are too expensive, and some lines never realize a profit. However net wealth is over 10 Billion$.
Time runs slowly as bits_per_month is set to 24. That's why one day lasts about 10 minutes. So for example you may enjoy night view for four minutes while with bits_per_month set to 20 (standard) it is something like a bothersome blinking light of 15 seconds. The game just wants to invite you to look and savour it.
You may download the save file here (https://pak128-german.de/michelstadt/Alt_Hamburg.sve).
Relax and have fun.