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Supply routes are great when a settlement is just starting out to get things off the ground, but what is specifically transferred along them? I know anything on the Junk, Aid and Mods tabs are transferred, and Fusion cores and Power Armor pieces aren't. Does that mean weapons, armor and ammo aren't transferred at all?

And what about Food and Water resources? Can I build a farming community with a surplus of food and use that to feed a merchant-only settlement, or are local crops always required? Ditto water.

  • An idea I just had regarding things other than Junk/Aid/Mods: What about Weapons/Armor that could be scrapped for components needed to make something else? Should be fairly easy to test. Just remember to use non-legendary items. – Iszi Dec 14 '15 at 15:10
  • @Iszi doesn't work. Which is good, otherwise you could accidentally scrap gear you left in your workbenches. Weapons and armor must be manually broken down either at the appropriate crafting station or placed on the ground and scrapped in construction mode. – Dallium Dec 14 '15 at 17:02
  • Why is that good? I mean, what sane player doesn't have dedicated non-Workbench containers for their weapons and armor? Everyone else should just call it "lesson learned" and reload. – Iszi Dec 14 '15 at 17:19
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The current accepted answer seems a bit unclear to me, and may actually be inaccurate. I'll try to explain better, by my understanding, here.

The only remote resources that are available to the player, in settlements that are linked via supply lines, are those which can be used for crafting. Even then, those resources can't simply be collected from the Workshop's inventory. The only way to access them is by using them in the crafting process.

This means that you can't drink Purified Water that's stored at a remote location, but you can use it to create Vegetable Starch. You won't be able to take a Blood Pack out of a connected workshop and put it in your inventory to heal yourself, but you can make a Stimpack with it. Etc.

This also means that not all Aid items will be available across a supply line. Meat that's already been cooked, drinks that have been made, or drugs that have been blended will most likely not be accessible because most of these items aren't used up by any recipes.

Mods are available to be added to a weapon if they are in a remote settlement's workshop.

Weapons and Armor will not automatically be broken down into components when crafting, so will not transfer via supply line.

Furniture, Walls, Turrets, Shops and other craftable settlement stuff will not transfer via supply line, with the exception of crops. When one stores a Mutfruit tree or a Tato plant, it simply shows up in the workshop as a Mutfruit or a Tato, and those items transfer for the purposes of crafting.

If junk in a remote, connected workshop is automatically broken down, the leftover components are deposited into the local workshop (the one the player is crafting from). (This needs further verification from somebody else - only 95% sure on this).

Nukapedia claims that food and water will be shared across the line, for consumption by settlers, even though the UI might not reflect this. More testing is still required on this, but from what I can tell, food and water is indeed transferred along supply line, but not in an obvious way. My observations:

  • Excess Food/Water production is not shared in a way that is obvious from the UI - you can't tell that Settlement B with 10 food shortage is taking food from Settlement A which has 10 food surplus.
  • However, a settlement with insufficient production will not report a Food/Water shortage (exclamation mark in the UI) as long as there is food and water in its workshop.
  • Excess Food/Water production ends up deposited as actual items (Mutfruit, Tato, Purified Water) in the workshop of the settlement that has the surplus (many players take the excess to sell for caps).
  • The surplus Food and Water items in the settlement's workshop will disappear on their own, and show up in the settlements with insufficient production, and thus those settlements will not report shortages in the UI.
  • However, if one consistently empties all the surplus Food and Water items from the settlement with excess production, the connected settlements with insufficient production will eventually run out of Food/Water items (Mutfruit, Purified Water), and when empty, will start reporting shortage crises in the UI.

So it appears as if Food and Water is transferred via supply line, but not instantaneously like crafting components. Further testing is required to determine the details of how it is transferred; also if this is a total misreading of observation or not.


TL;DR:

  • Mods, Aid, and Junk will transfer as needed for crafting.
  • Nothing will transfer for the purposes of picking up into inventory.
  • Weapons/Armor do not break down into components automatically, so will not transfer.
  • Craftable settlement items (furniture, turrets, walls) that are then stored in the workshop will not transfer, with the exception of crops.

*Testing Needed

Please comment/edit if you can help answer any of these, to further clarify how supply lines actually work.

  • Food/Water: Are surplus Food and Water items (Mutfruit, Purified Water) in settlements transferred instantaneously at a particular time (vendor refresh? 10:00am every morning?)? Or are they actually transferred by the provisioner assigned to the supply line (do the Food and Water items in a settlement disappear when the provisioner hit the settlement with the surplus, and reappear when the provisioner reaches the settlement with insufficient production?). If the latter, is the AI smart enough to transfer enough items along long supply line chains? e.g. if the settlements are connected A->B->C, and A has a surplus water production of 20 and both B and C are short by 10, will the A->B provisioner take 20, so that the B->C guy can take 10 and leave enough for both B and C?
  • Food/Water: If all your settlements have a cumulative production of 250 water and you only have 150 settlers, for a surplus of 100, and you sleep for a month, you don't end up with 3000 Purified Waters. Similarly, my workshops don't have 10000 Mutfruits piling up. What's the limit on excess Food/Water, and when does it correct? What's the ideal frequency and time to grab the surplus and sell so that extras aren't lost to this correction, and how much should one leave behind?
  • Scrap: What happens if an item on the remote end of a supply line has components other than, or in excess of, what is needed for the item being crafted? Does the extra stuff come to the local settlement, get left at the remote settlement, or disappear?
  • Regarding your very last question, according to the Fallot Wikia site, when a remote item is scrapped, and not all of its components are used, the remaining components are added to the local workshop. As far as the timing of food transfer, I suspect it's actually the same as it is for scrapping, i.e., on demand - remote scrap materials are transferred only at the moment they are needed for crafting; remote food surplus is transferred only at the moment that a settler needs to eat and the settlement has no available food. But this is speculation on my part. – Dan Henderson Apr 17 '16 at 17:00
  • And, yes, surplus will be shared as necessary anywhere along the chain. If you have a vast network of supply lines connecting a dozen settlements, one of which produces enough food for the total population of all of them, you can make any of the others completely cropless. (Though there have been reports of a bug with certain configurations - particularly having two "loops" that share one settlement can sometimes cause the Pip-Boy to report zero food and water in that settlement. So it's probably best to either make a single, large loop, or a "star" network with only one path between any two.) – Dan Henderson Apr 17 '16 at 17:06
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Only item classes which can be accessed from workshops will be transferred between settlements. Unfortunately, this does indeed mean that weapon, armour, and ammo are not transferred, and neither are food and water resources.

  • To add to this, items stored at a workbench in one settlement are also not transferred along the supply lines to other settlements: gaming.stackexchange.com/questions/242808/… – king14nyr Nov 18 '15 at 20:00
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    I think it should be clarified that nothing is "transferred". It's just available for use when crafting. I suppose you could consider it to be transferred at the moment it is consumed. – DCShannon Nov 18 '15 at 22:44
  • Well, yes, true – SaintWacko Nov 18 '15 at 23:03
  • what about weapon mods? – Josh Nov 24 '15 at 18:17

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