Amtrak now has a sale on their USA rail pass
Regular price is $499, now on sale until January 17th, for $299, for travel over the next 120 days. You can book up to 10 different segments, for travel over 30 days, once travel is initiated. Coach class only, no upgrades. You can read about it here:
https://www.amtrak.com/home.html
https://www.amtraktrains.com/threads/usa-rail-pass-for-just-299-1-10-1-17-25.88395/
https://www.reddit.com/r/Amtrak/
I usually do this once a year, and it makes for a cost effective ride around the US, with stopovers in interesting places. 
= new reply since forum marked as read
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