I suppose what I’d ask you is: are you an expert in urban or transport infrastructure? Because, if not — and I say this in the politest way possible — the argument you made was probably a fairly basic one that people have heard a thousand times before. Your gloss of it here as ‘trains cannot replace cars’ suggests to me that you’re not really engaged with the issue (nobody thinks ‘trains can replace cars’).
Essentially what you did is the equivalent of me going into a Christian community and saying, ‘But if God exists, why is there evil in the world?’ as though no Christian had ever engaged with that idea, then acting surprised when people started rolling their eyes at me.