I am not 100% certain. It could definitely be sand being sprayed. The old trains don't have it, only the newer ones. I just hear compressed air being sprayed un

I am not 100% certain. It could definitely be sand being sprayed. The old trains don't have it, only the newer ones. I just hear compressed air being sprayed under the train when it's wet and the train is skipping on the track. Something is being sprayed onto the track.