Dwarf Fortress Magma Minecart No Pump Magma Delivery
Channel: Paul Spooner
Date: 2023-01-26

Want magma smelters at arbitrary locations in your fort? Set up a magma minecart fill station and your dwarves can deliver magma anywhere! No pump stack required! No danger of flooding your fort with magma!
The dwarves will haul the minecarts a lot faster if you set up a stockpile with magma-safe wheelbarrows, but I wanted to keep the demonstration simple.

I got a great question in the comments about "minecart stops" so I've added my answer here to help clarify.
Practically speaking, you need hauling stops at both the magma filling station and the destination, but only the magma destination needs a track stop (set to auto-dump in the direction of the hole).
The question about "minecart stops" is a tricky one, because there are two similarly named but distinct "minecart stops" in Dwarf Fortress. Both involve minecarts, but one is a hauling route designation, while the other is a construction.
There's the "Track stop" which is a Construction (hotkeys b-n-K) and allows you to arrest the motion of minecarts and dump them. The bridge does NOT have any "Track stop" on it, both because it is unnecessary, and because you can't place more than one "building" in a tile, and the bridge is already there. Also note that, despite the name, a "Track stop" does not have to be built on minecart tracks.
Then there is the hauling route "stop" which is set from the "set hauling routes" menu (hotkey H) and which allows you to designate the locations and conditions for minecart hauling. There are two of these "route stops" on the bridge at the filling area, which is how I get the dwarves to move the minecarts back there.

Timestamps:
00:00 Intro
00:37 Fill Station Setup
01:15 Fill Station Operation
03:29 Magma Delivery
04:08 Demonstration
07:22 Reset the system
10:02 Final Notes