Info
This tutorial covers basic minecart systems involving Minecart with Chest Minecart with Chest Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 43 PE: 98 Network ID PC: 10 Entity ID chest_minecart Drops 1 Minecart 1 Chest plus contents Health points 6 () 
and Minecart with Hopper Minecart with Hopper Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 46 PE: 96 Network ID PC: 10 Entity ID hopper_minecart Drops 1 Minecart 1 Hopper plus contents Health points 6 () 
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Item loader
An Item loader is a system which stops a Minecart with Chest Minecart with Chest Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 43 PE: 98 Network ID PC: 10 Entity ID chest_minecart Drops 1 Minecart 1 Chest plus contents Health points 6 () or a Minecart with Hopper Minecart with Hopper Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 46 PE: 96 Network ID PC: 10 Entity ID hopper_minecart Drops 1 Minecart 1 Hopper plus contents Health points 6 () to feed them with items, and when it`s done it restarts the minecarts.
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Design A is probably the simplest. When the hopper has at least one item, it deactivates the Powered Rail Powered Rail Transparency Yes Luminance No Blast resistance 3.5 Tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data value dec: 27 hex: 1B bin: 11011 Name golden_rail A powered rail is a type of rail that 
so a storage cart coming from right will be stopped under the hopper. After feeding the cart with all the items in the hopper, the powered rail gets reactivated so the cart starts going right. A possible downside of this design is that the powered rail is always active as long as the hopper is empty so if a cart comes to the empty loader it immediately bounces off to the opposite direction. This might lead to an inefficiency of the system if there is a great distance between the loader and unloader.
Earliest Known Publication: 28 Mar. 2013
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Design A` is an obvious variant of design A to make it flat.
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Design B
The delay of the topmost repeater is set to 4 ticks, and the delay of leftmost one is set to 2 ticks.Design B is a combination of a hopper and a falling edge detector. It activates the powered rail for 4 redstone ticks only at the moment when the hopper becomes empty, so a cart will stop there until you put some items into the hopper and all of those items are transferred to the cart.
For all the designs shown above, minecart with chest will be stuck at these loaders when the cart has no space to receive items from loaders.
Videos
Item unloader
An Item unloader is a system which stops a Minecart with Chest Minecart with Chest Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 43 PE: 98 Network ID PC: 10 Entity ID chest_minecart Drops 1 Minecart 1 Chest plus contents Health points 6 () or a Minecart with Hopper Minecart with Hopper Type Vehicles Durability N/A Renewable Yes Stackable No Internal ID PC: 46 PE: 96 Network ID PC: 10 Entity ID hopper_minecart Drops 1 Minecart 1 Hopper plus contents Health points 6 () to take items out of them, and when it`s done it restarts the minecarts.
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Design A is probably the simplest. As soon as the hopper receives at least one item from a cart arrived above, it deactivates the Powered Rail Powered Rail Transparency Yes Luminance No Blast resistance 3.5 Tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data value dec: 27 hex: 1B bin: 11011 Name golden_rail A powered rail is a type of rail that so the storage cart came from left will be stopped on top of the hopper. After taking all the items in the cart, the powered rail gets reactivated so the cart starts going left. A possible downside of this design is that the powered rail is always active as long as the hopper is empty so if a cart approaches to the unloader too fast, there is a non-negligible chance that the cart bounces off before getting braked by the deactivated powered rail.
Earliest Known Publication: 28 Mar. 2013
Design B is a variant of design A: It has a detector rail which temporarily deactivates the powered rail to prevent carts from bouncing off.
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Design B
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Design B
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Design B
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Design B
Level 4 (top)For both designs shown above, minecart with chest will be stuck at these unloaders when they have no space to receive items from carts.
