Last year I travelled in Platskartny from Tashkent to Khiva -
it was the best sleep I had in 5 months in Central Asia!
In the open carriages there are many families, and for the sake of the sleep of their small children they make sure everybody keeps quiet, Plus the slow going train rocked me to sleep like a baby...
So for me it is definitely a Yes for Platskartny.
Safe travels!
Kasia