Long freight trains with dozens and dozens of cars carrying Tanks, artillery, assault vehicles, missile launch systems, supply and support trucks, and a huge amount of ammo and artillery shells, have been pouring into the Russian army's staging areas in eastern Ukraine for weeks.
They will be used in the massive assault to annihilate Ukrainian forces around mid November when the ground freezes, and decisively end the war in Russia's favor.
IF the video is recent, and it's in Minsk like the title says, then this train is not going to Eastern Ukraine.
There are no tanks or missiles, and no IFV's or armored assault vehicles. There are 2 command and staff vehicles, a couple mobile kitchens, and a bunch of trucks. A handful of BM-21 Grads and a few BM-27 Uragan MRLS launch vehicles and a couple transloaders.
And a scooby-doo van, There is always a scooby-doo van, lol.
My guess is they will be part of the Russian component of the Regional Group Force with Belarus.
All dated equipment, but it looks refurbished. Fresh paint and new tires, and they're not alll banged up and dirty. There are no invasion markings, but the symbol on the door on the trucks identify them as belonging to the 4th Guards Tank Division.
4th GTD is part of 1st GTA, which is commanding the RGF.
My guess, assuming the video is legit- recruits sent to Belarus as part of the RGF, and they will join the self-propelled artillery regiment of the 4th GTD.
If Putin takes another run at Kiev, these vehicles would be part of it. More likely they will just shoot their rockets from Belarus territory...