Chest carts and Hopper carts will move a LOT further than all other carts, including empty, from a single powered rail.
In the test I did, this is roughly 50 blocks further than the empty cart.
I'd understand if it was a weight thing, but these carts travel ~6 times further than the empty cart, and the cart with TNT in it!
Duplicate of MC-7799, please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.