Minecart chains, the item that could save the furnace minecart!
When used on a minecart, a clink sound plays (coupling, thanks Pyrarson) and the chain is attached to the minecart, much like a lead attached to a fence. Using the chain on a different minecart will play the same clink sound and connect the two minecarts, and using a chain on a minecart and using the chain on the same minecart will remove the chain. Clicking on a chain connecting two minecarts will drop the chain and disconnect the minecarts. This would work well with furnace minecarts, imagine the trains!
Using a chain on a minecart and then moving will pull the minecart as well. Combine this with a fence-connecting ability like with leads and you can keep a minecart in place for the time being, making minecart transport easier without all the messy redstone.
Edit: I haven't touched this post in a while, and WOW all of you really like this post, even being the first result for "chains" and it's impressive! I'll try to integrate some ideas with this post over time to make it better. Feedback!
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