Minecart with Furnace

Powered Minecarts are a special type of minecart, that was implemented in the Seecret Friday Update 7. It accepts coal or charcoal as fuel for powered movement and can be used to push other minecarts, thus functioning as an engine.

Crafting
A powered minecart is crafted from a Furnace and a Minecart, as shown below:

Destroying a Powered Minecart will give you back a Furnace and regular Minecart; however, any fuel used will be lost.

Usage
To use the Powered Minecart, first place it on a track. Select your fuel (currently only coal or charcoal works) then right-click on the Minecart. When right-clicking on the Minecart, you want to face the direction you want it to travel. You can make the cart change direction by right-clicking it while facing the opposite direction of travel. No coal will be lost doing this.

Behavior

 * Breaking a powered minecart gives a plain cart and the furnace back (but not fuel).
 * Powered minecarts cannot push other carts around 180-degree hairpin turns.
 * A player in a cart adds significant weight, requiring more power to push.
 * 1/1 (and possibly 1/2) slopes are too steep for a single powered cart to push a single occupied cart uphill. 1/3 slopes appear to be gradual enough for success.
 * Going up at a slope of 1/3 (two flat-rails between each up-ramp) will allow you to push your train upwards, as it appears the powered  minecarts have force applied in intervals.
 * Multiple powered minecarts yield more pushing power; 2 powered minecarts can push a player-occupied minecart up a 1/1 slope. (although very slowly).
 * A Single powered minecart can push an occupied minecart up a 1/1 slope if there are additional minecarts being pushed (possibly due to bumping physics).
 * When a powered minecart runs out of fuel, it does not break.
 * One piece of coal seems to power the minecart for 4 minutes. Distance varies based on ramps and other objects on the track.
 * If too much stress is put on the powered minecart then it will stop. Right-click activates it again.

Trivia

 * Storage and powered minecarts are the first crafted items created from two separate crafted items.
 * Right clicking will cause the Minecart to go forward a little bit, even if it is not loaded with fuel.
 * In the Inventory, the item is named "Minecart with Furnace".
 * When using a Powered Minecart in SMP, no smoke is made.

Bugs

 * As of Beta 1.6, powered minecarts seem to get 'stuck' inside a normal minecart (slighly overlapping) and will thus not move.(see image below)
 * (Beta 1.6) Powered Minecarts simply won't push any other minecart and treat anything on the track including minecarts as barriers.