The Soviets/Russians have had mobile nuclear ICBMs (trucks) in the forests of Siberia for decades. Nothing new and as you know most trains don’t arrive on time, esp. on longhauls.
The ADTs are more of a threat (aka “Backpack bombs” or “suitcase bombs”).
So is a drunk Russian agent holding in a week-old Vodka fart.
Oh, man...a week old...