Factorio

Ah, I think I may have used in/out inversely to you when I set up trains.

"copper in" is where copper is put "into" the train system "copper out" is where copper is dropped

I Use:
[Material Name] Request/Pickup

I had a very short and consistent scheme for a while. No text, just icons.

{materiel icon}{chest icon}

For example, one station provides iron plates to the rail network (loads onto train), the other requests crude oil from the rail network (unloads from train):

Downsides: Some uncommon icons can be hard to read. Some liquids are similar in color and hard to identify when seen alone.

So later we changed to a better readable format. Examples:

[L] Iron Plates

[U] Crude Oil

For production facilities i use the facility icon (miner, oil rig, etc.) then an arrow to the right and the icon of the resource being extracted:

[Miner] -> [Iron Ore]

For consumers i do the consumer icon (f.e. smelter) arrow to the smelter and resource icon after that:

[Smelter] <- [Iron Ore]

I use LTN, so I don't change them. Makes for an interesting map view.

I am usually doing [Station purpose] - [resource] [in/out] E.g. iron ore smelter - iron ore in iron ore smelter - fuel in iron ore smelter - iron plates out (where iron ore and fuels is going INTO the station, and iron plates are going OUT of the station)

Makes it pretty clear, and has never failed me yet.

I often see [L] for load and [U] for unload used. So [L] Copper Ore and [U] Copper Ore. Or instead of "Copper Ore" they just put the icon of the resource.

I use rich text representation of the appropriate logistic chest and the product. Requester chests for consumers, provider chests for producers, buffer chests for marshaling areas, when I play railword with really long distances, and storage chests for "service stops" that doesn't map clearly into one of the other three. My personal style is to have a number of trains dedicated to each provider. Thus, the provider stations keep their default names in addition to the rich text. The snip below should explain what the gist of it.

I also use "in" and "out", in combination with rich text. For example, iron ore stations might be:

[IRON ORE RICH TEXT] 1-4 Iron Ore - Out [IRON ORE RICH TEXT] 1-4 Iron Ore - In

Where the "Out" station is at the resource patch (ore comes out of the ground) and "In" is at the base (ore goes in to the factory). I also include the train type in my station names (1-4).

See https://lemmy.ml/comment/686775 for what I mean by rich text