To setup M.I.N., add flyash to the Queue.
Place a wagon you intend to use on the route.
Add this asset in the right panel and choose Liters or Units. Remove the wagon.
In queues change the 100 to 1000000.
Choose to unload from vehicle.
In Product type 1000000.
Should work then.
Look for Ground_grilled Unloader, a number are available.
Cheers,
Mike