For example, the Crescent used to be a Washington-Atlanta (and reverse) night train.
Same for Chicago-Denver, NY or Philadelphia-Chicago and others.
Crescent definitely. First Amtrak take over some days many more passengers especially holiday times.
When SOU RR it would even run 2nd sections ATL <> WASH and remove extra cars at WASH from 1st section. 2nd sections often beat 1st due to no intermediate stops. happened to me once.