Since I am a very long time player of TT as well as all the other tycoon or simulation games, I now think OpenTTD is the only one which gives me abilities to play the transport simulation game I want :
SimPolis is inspired by Berlin and Hamburg in Germany. Habited by several millions people, that growing city quickly needed fast and reliable public transport systems. It has several S-Bahn (regional express network) and U-Bahn (subway) lines, but also local lines from private companies as well as many bus and tram lines, plus several ship lines.
Five airports makes SimPolis connected to the rest of the world, as well as the intercity and fast trains connections.
Here are the first screenshots. More will come later, as well as a video from the S1 line I’m preparing. Enjoy !
EDIT : Movies list :
S1 movie
S2 movie
SimPolis Rail Transit Map :
The aerial view of the city :
Hahnhaven :
Eichenburg station, stop of two U-bahn lines :
Unterbrücken, an important station in the network :
Passengers can often transfer from one line to another :
The center of the city is very rail dense (however there are also very quiet places elsewhere) :
Another S- and U- station :
At many places, the trains cross over the ship lines :
S-Bahn bridges :
Another crossing station :
One of the main stations in SimPolis : S-bahns, regios and intercity stop here :
In some places, several train lines go parallel :
Strauswald is a huge station with many trains stoping here :
A small district on an island :
S-bahn and U-bahn :
The ICE on one of the high speed tracks, leaving SimPolis :
Near the Ketendorf airport, there are a lot of small districts :
Wolfswald, the second most important station in SimPolis :
Some quiet districts, even if a high-speed track runs near :
The are many bridges for the trains in SimPolis :
And finally, SimPolis main station :
More coming later
Kind Regards,
TheRack
I love how different the parts of the city are - for example crowded center with houses everywhere, quiet districts with just a few roads and a lot of trees etc. 
