I would say the movement of the train is a bigger impediment to sleeping on a train than noise. IMO the worse offender is the AutoTrain. It clips along at 70 mph non-stop to Florida on CSX RR trackage that is not the greatest. The movement can be bone jarring at times.
Most of the other routes that we have taken are far better. Station stops ( a few 15-20 min) , lower speeds and those on NS trackage make for a more comfortable nights sleep. Some people seem to sleep fine on Amtrak while others like my wife have extreme trouble sleeping. I can usually get some sleep but never more than 4-5 hours worth. Have hardly ever been bothered by noise from other passenger.
Most of the other routes that we have taken are far better. Station stops ( a few 15-20 min) , lower speeds and those on NS trackage make for a more comfortable nights sleep. Some people seem to sleep fine on Amtrak while others like my wife have extreme trouble sleeping. I can usually get some sleep but never more than 4-5 hours worth. Have hardly ever been bothered by noise from other passenger.