I can tell you they are worse. At least on a plane you have a seat...not true on a train, especially anything regional.
Some are one step short of the trains in India with folks hanging on.
European trains, at least.
On the French TGV trains, seat reservations are mandatory. This is also true on the Eurostar trains through the Channel Tunnel, the Thalys trains through Belgium, the two competing Italian high speed rail services, and the AVE high speed trains in Spain.
You can stand up in the restaurant/bar “bistro” car if you want.