Or it could carry an iron wedge underneath, land in the track, weld the wedge using thermite, and fly away. Then you wait for the train to derail.
Or you can fly multiple drones l, land them on the track, deploy large amounts of c4 or thermite, fly away and then detonate the payload to destroy the track.
You land on the train in-motion, then blow it up at a random time along its journey. The range of any train is much further than the range of any drone.
I think the idea is that you ride the track to extend the range of the drone since train tracks are much more efficient than flying in terms of battery usage.
Ahhh, that would be much better. Though a drone wide enough to straddle a Russian rail gauge sounds pretty beefy. I guess it'd already be a serious affair, if it's carrying enough munitions to delete a train in motion.
I still think it'd be simpler and smarter to plant time-bombs on top of trains and fly back.
On a different note, I think they should use RC cars as well, I mean could you imagine what the Russians think when a lighting Macqueen RC car comes rolling into their trench with a Grenade attached to it
Why use four wheels when two is fine? You already have all the makings of a control moment gyro, and a hyperspace pirate just posted on youtube how to make a gyro-monorail.