>>23874511. The helicopter will start moving towards the back of the wagon because it doesn't feel a force
2. The wagon will push the air - it will also become a bit more pressurized at the back.
3. The drone will feel the wind because of the air being pushed and will start moving forward
4. When the train stops accelerating, the drone will stay hovering, probably pushed a bit to the back of the train.
Just put a weighted model car on a loose spring and see what happens when the shit accelerates in the train
