Fast train with no motor/wheel noise

[SNIPE]

Hi,

How can I have a train that makes no sound when running over the rails or whatever it runs on (could have small tries and run in a groove made from plates/bricks.

I also don't want any noise from the motor inside of it and I need it ti run as fast as possible, it will just go past a window every few seconds so I can either put it in reverse or loop it back to the same piece of track (which will mean having an oval track shape.

I don't think the window and wall will deaden the sound too much, maybe I should just have it attached to string that is winded into a large drum that is hidden somewhere far away? I'm not sure what the 'good' ideas would be

[locoworks]

you can't unfortunately.