[mytailorisrich]

You can do Paris-Berlin-Moscow-Beijing by train via the trans-Siberian, or via Ulan-Bataar with the trans-Mongolian.

Quite an iconic route that became much simpler administratively to travel in 2000s but perhaps again trickier now because of the situation with Russia.

[andrewshadura]

You can't, unfortunately. No trains run between Poland and Belarus.

[mytailorisrich]

Oh that's a shame... I believe the whole journey was not an issue during the "warm period" of the 2000s.