Marvelous Mine Cart (a Cave-pril creation) (Patreon)

This piece of equipment would be highly prized by miners of all sorts, as it is able to move heavy loads along rails without any outside source of power needed. As long as it's got rails to move on that aren't blocked, and someone who can speak the command words in Dwarven/Dwarfish, it'll do its job.

This was made for day 2 of Cave-pril, a month of daily, underground-related homebrews.