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In St. Petersburg there are trolley buses instead of tram. I'm sorry if you found this disappointing. There will be trams again in the London DLC for sure!
 
You should have 3 trolleybuses instead of the trams in St. Petersburg.
If you have 0 vehicles in the trolleybus list, then mods are probably causing it. In this case, please post here a list of your mods (or just your log_metro.txt file).
 
I don´t understand, why we can´t use trolleys and trams together on the MAP (without MOD). And finaly, the catanery looks terrible. Why don´t you have made the trolleys under the category busses?
 
I don´t understand, why we can´t use trolleys and trams together on the MAP (without MOD). And finaly, the catanery looks terrible. Why don´t you have made the trolleys under the category busses?
This has to do with some limitations to the game's engine. It is impossible to have more than 5 types of transport in one map. The trolleybuses are actually based on the tram.
Mods that allow trolleys and trams on the same maps don't work very good because the game gets "confused" when catenary lines meet tram tracks.