It's comically (and extremely variably) priced. A trip from DC to NYC and back would be ~$25 in electric costs with a typical electric car versus Amtrak could easily be $300+ though possibly as cheap as $50 if you are flexible to awful hours like depart at 4:30am or something.
You should factor in the time/stress/wear costs but yes, I've found driving to be significantly cheaper than even the DC Metro most days.
the actual cost of a trip between times square and the national mall is about $200 all things considered based on the ~0.80 federal mileage reimbursement rate for 250 miles. that train corridor is overwhelmingly successful as well so the idea that amtrak isn't a good deal is at odds with reality.
That's assuming you don't already have a time-depreciating asset in your possession. Per mile cost is about halved if you drive significantly more than average.
People in and around the acela corridor drive significantly less than the national average.
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