Development update

Development Update for the upcoming version 1.13
I've uploaded the latest version onto the testing branch for testing.
How to get the testing branch update?
Select Transports in your Steam library and open the settings window. You'll see a Beta Tab where you can choose the "testing" entry.
Changes:
Industry Extension
Once you have bought an industry you can build industry extensions.

Energy management
Power plants will now have a maximum energy supply capacity. You'll need to manage the energy supply. The power plants good requirement depends on the energy demand now.
Energy overview map
I've implemented an energy overview map where you can reset the energy supply for cities and industries.

Submarines
I've added the submarine vehicle type to the game. The submarine will offer sightseeing tours to the passengers. It will wait for full load at the port and start roaming around the area once it's fully loaded.

Placement helper
While building city buildings or industry extensions you'll see possible positions for the buildings now.

and more.
I'll update the default branch with more changes soon.
I recommend starting a new game to test all new features.
Feel free to share your thoughts.
Thanks for your patience and support.