What's wrong with rail transit?

Everyone says this and sometimes even recall a romantic ride on a euro rail.  Here is how to respond to common statements about rail?
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Rail is super energy efficient.
It can be. Did you know that the average BART rider uses as much energy as someone driving a Prius alone?
 
Rail lets you carry more people.
Yes, one BART line can carry more people per hour than a single highway lane full of cars or buses. The AutoBART system is designed to carry twice as many people per hour.