After 24 hours in the train, we arrived in Brest (Брэст) on Poland-Belarus border (not to be mistaken with Brest in France uh!).
Rails in Russia, Belarus and Mongolia have different spacing compared to European standards. So we stopped 3 hours in Brest to change the bogies.
That's still some good time to stretch your legs, buy some Chicken for lunch... and jump of course!
Behind me is our Amsterdam - Moscow train.