Bulk Wagons

Factorio 2.1 mod (Space Age optional) that adds a bulk wagon for ores and other bulk goods, plus an unloading bunker and a loading silo that each serve a whole wagon.

• Bulk wagon: cargo wagon with three compartments that only accepts bulk goods (every mined resource plus ice, carbon, sulfur, uranium, holmium ore and seeds). Anything else is handed back or dropped next to the wagon. Colourable like a locomotive. While a bunker unloads it, the cargo visibly drains through the open bottom flaps.
• Unloading bunker (6 × 6 tiles, first research): built over a whole wagon slot, the track runs through it. Empties the stopped wagon through its flaps into its inventory. Its gratings can be walked and driven on, its rims block players and vehicles.
• Loading silo (6 × 6 tiles, second research): stands over a whole wagon slot and fills the stopped wagon through three chutes from its inventory. Solid beside the track.
• Bulk connectors in every belt tier (yellow with the first research, red, blue and green with the belt research): the game's loaders, docking onto any tile of a long side of a bunker or silo. They run at their tier's speed; without a belt they hold the goods back, nothing lands on the ground. Inserters work on both buildings too.
• Wagon slots: near a train stop, bunker and silo snap onto the slots where the wagons of a halted train stand (7 tiles apart behind the stop), and the placement indicators show the free slots. Elsewhere they keep the 1-tile grid along the track; press R to turn them.
• Stations are colourable like the wagon: colour panel next to the station window, or copy the colour from a locomotive, wagon or train stop with Shift + right/left click. A station in the train's colour matches it.
• Every Space Age planet gets its own look for wagon and stations; the right variant is placed automatically, the item stays the same.
• Circuit network: station contents are readable; a panel next to the station window adds an enable/disable condition, reading the docked wagon's contents and a wagon docked signal (W = 1). Blueprints keep settings and wires.
• Update from 0.3: the old three-per-wagon stations (pit, belt loader, portal silo) are replaced by one bunker or silo per wagon slot, with their contents, settings and colour. Where the new building has no room the old stations stay and the spot gets a map marker.

Settings

The wagon weight is for mods that simulate train mass: 1000 is the vanilla cargo wagon, 2000 the locomotive.

Other mods can register bulk goods with remote.call("bulk-wagons", "add_allowed_items", {"my-ore"}).

Source, Blender scripts and headless tests: https://github.com/vertexvaar/factorio-bulk-wagons