Hm... When you push a cart using a horse and with something lift, the cart will walk in crawl speed, however, the horse not, and the cart will stay behind walking in the slow speed, looking it's walking on it's own.
1. Tame and ride a horse 2. Right click a cart 3. Use speed 3 or 4 4. Watch as the horse moves faster than the cart 5. Use speed 1 6. Occasionally the cart will be halted by the horse's hitbox
Are horses even supposed to be able to pull carts?
Edit: Oh damnit, someone already reported this here. Please merge.
Horse cart pulling is incidental, and not something we've really put work into. Yes, it's wonky right now.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."