Dugby is looking for the ancient city Gorondia, but he can't get the mine cart to move.

Quest Location

Talk to Dugby, just north of Marakuguc Shrine in Goron City, to start the quest.

Move the Mine Cart

Move the minecart onto the tracks, then find a nearby Fan and attach it to the back. Tell Dugby that the cart is ready, then get in and hit the fan. At the other side, Dugby will see YunoboCo HQ and get out of the cart.

Reward

Dugby gives you a Zonai Charge.