Trains can't be the answer. What are you gonna do, put large networks railroads connecting every part of a city easily and accessibly, perhaps underground so they stay out of the way and can operate without unduly harming the natural environment? Let me guess, you also want to put railways stretching across countries so that large amount of people and/ or cargo can be transported with relative speed and efficiency while also avoiding creating large swaths of asphalt wastelands? Preposterous!