Better Mineshafts

I've thought of a few ideas for mineshafts that could be used in the cave update

Tracks

• Completed (without the random gaps between the rails)
• Much more elaborate and unpredictable, stretching through the entirety of the mineshaft
• Forks in the track, with a lever to switch directions to avoid a deadly drop (like a classic Hollywood scene)
• Random minecarts zooming down the track, some have hostile mobs, some have treasure chests

Minecarts

• Larger
• Multiple may be connected together at front and back, like a train
• Breaks; a lever which stops the minecart and makes screeching noises
• May contain any block. Instead of crafting the minecart with a block, the player could simply place any block in a minecart
• Shouldn't have to be placed on rails to be placed