In the Berlin scenario one of the objectives offered is called 'A Helping Hand'. If I remember correctly it is offered by a gentleman that runs a bus/tram maker.
The requirement for the objective is to purchase 3 new buses or trams, and no reward is listed on the objective screen, but after completing it the man says he 'will fix something up for me.'
What is he fixing up? Is he just saying that, meaning the objective was just to get me to buy his vehicles, or has something else changed?