Concept of the idea:
"Choosing this allows you to click on an existing station to change it to another kind of station. The developers can fill in the details, but I think you should be given limited (2 or 3) choices on what to change that station to.
This would make the game less luck based, more strategic, and most importantly: less frustrating. It would mean less losing because of an unlucky streak of circles and more losing because of slowly losing the efficiency that your Metro needs as it expands."
Source: http://steamcommunity.com/sharedfiles/filedetails/?id=309702781 ; Thank you Hammershaft for letting me post your idea on the forum.