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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.
Or detonate the payload beneath a train to destroy both the train AND the track
You would need a far larger amount of explosives than a small drone can carry for this. Trains are fucking massive.
True, however I have to assume that fuel tanks tend to be lower on the locomotives (and therefore nearer the tracks), so as long as the explosive is high enough energy to set off the fuel, it'll do a lot of the work for you. As will momentum, because all the explosive has to do is damage the tracks and jostle the engine, and the length of cars behind will keep on moving, go of the rails, and slam into the fireball.
Hitting the diesel tank on the bottom of a locomotive won’t cause a huge explosion with enough force to lift it off the tracks. There’s a good chance it just causes a fire on the leaking fuel. The diesel locomotive might even be able to keep going for a bit by using its batteries.
A diesel locomotive weighs in at about 200 tons. That’s like three tanks.
That's what I thought, keep it simple.