It's cheaper, and I take it because it's a better experience in a lot of ways, but it's also regularly not full. I've had entire train cars to myself before.
I commute on along the North East Corridor, and if you want a train that'll get you into NY by around 9am or leaves around 5-6pm, you're definitely not getting that for $15 on a weekday.
Bullshit.
I went to school in Boston. To get a one way like that I'd have to book weeks in advanced and it would be in the middle of the night.
I'm on the Amtrak website right now and if I book a one way trip from South Station (boston) to Penn Station (NYC) for today, it is $250 (tbf, it would be a last minute booking). If I book one for weeks in advance, it's still at $40-100.
May 7, 7:50pm-12:15am
$20
[X] Weeks in advance
[ ] Middle of the night