Mineral you are correct about Buses. After the 1920’s i actually deleted all my trains and stuck with trucks and Trams. They were cheaper about 40 km/h slower but easier to run and able to put more on a line. Trains would be SO much better if i didnt have to have em stop to only got one platform when the other two are open. Its a pain having 2 lines stop for another line, although ive gotten around this by have each line manually enter the station on a different track then joining the lines and continuing on their merry way. As for suggestions goes i have only one and it is as follows:
The ability to build and demolish factories, except it needs to be at an excessive cost that scales as the time periods progress to make it viable to build yet also detrimental. I can also see how this could be overpowered by deleting or building new production facilities to make more and more cash. All i can do is throw the suggestion out there.