Business Class During Peak Travel Periods

[Evan's Trains]

I remember on Veteran's Day 2013 I took Amtrak 174 from WAS to NHV and the 3rd coach was a full Amfleet I Business Class Car and also the last car on the train had this too. Does Amtrak do this during peak travel periods? or was it just a coincidence?

 

[Acela150]

It happens when cars are shopped.