When a cart is placed on a powered rail on an incline, the cart sits there and is not affected by gravity, whether the rail is powered or not. (sometimes in survival mode when player-placed it goes down, never in creative or by dispenser). This is a system that has been used to pick up entities at the bottom of the system. I've attached an image, and there is a working setup in this video at the 17 minute mark, you need only watch for a minute or 2. https://www.youtube.com/watch?v=iKxah_YU8JU
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Asteraoth
Thank you for your report!
We're actually already tracking this issue at MC-145638, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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