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Detector Rail

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[edit]Detector Rail
DetectorRail.gif
Detector Rail
Type

Non-Solid Block

Physics

No

Transparency

Yes

Luminance

No

Blast resistance

3.5

Hardness

0.7

Tool

This block can be broken with any tool, but a pickaxe is the quickest

Renewable

Yes

Stackable

Yes (64)

Flammable

No

First appearance

Beta 1.5

Drops

Itself

Data value

dec: 28 hex: 1C bin: 11100

Name

detector_rail

Detector Rails are a type of rail that act like a pressure plate, and the first rail switch.

When any kind of Minecart is on top of the Detector Rail, it will generate a redstone signal. The signal will be transmitted to blocks that are adjacent to the detector (including Powered Rail) and redstone placed under the rail, similarly to pressure plates.

Contents

[edit] Crafting

Detector rails are crafted like normal rails, but with a stone pressure plate instead of a stick, and the addition of redstone.

Ingredients Crafting recipe

Iron Ingot +
Stone Pressure Plate +
Redstone

Iron Ingot
Iron Ingot Grid layout Arrow (small).png Detector Rail6
Iron Ingot Stone Pressure Plate Iron Ingot
Iron Ingot Redstone Iron Ingot

[edit] Uses

Detector rails can be used for many things. One train station-like feature could be activating a Note Block to indicate that a minecart is approaching, or a note block in conjunction with a redstone torch to have a grade crossing signal. It is easiest to simply wire a series of 4-6 detector rails, one around every 20 blocks, to a note block and an inverter that powers a Redstone Torch. As the cart passes each detector rail, it will trigger the circuit for one flash of the torch and a chime, thus giving you 4-6 chimes before the cart reaches the crossing.

Detector rails can be used with a memory cell to power powered rails for long tracks.

Additionally, they can be used to create a one-way gate to a Powered Rail, with any carts coming the other way slowing down or stopping completely.

They also can be used to activate dispensers filled with arrows to create a minecart-friendly mob trap.

As a defense mechanism in multi-player or for your own challenge, you can make a rectangle using powered rails, regular rails, and detector rails. Then, make a box around it with glass (except the floor). At every detector rail have a redstone wire leading to a dispenser filled with arrows. When you begin the movement of the mine carts they'll pass over the detector, firing the arrows in a constant pattern until you run out of ammo. It is also good for speed killing by filling a hole with mobs and slaughtering the mobs inside; you can get a lot of resources this way.

Example for signal strength of a full minecart (27 stacks) and a half-full one (14 stacks)

They can be used for multi-layered piston doors with repeaters and redstone.

Redstone Comparators can detect how full a cart is if the cart is on a detector rail, however the power they generate will disable all hoppers, droppers and the like feeding into or from the cart upon them. They can be temporarily placed under carts in storage systems using sticky pistions to read the currently used capacity.

[edit] Video

[edit] History

Beta
1.5 Added detector rails.
1.5_01 Fixed a bug where detector rails couldn't be placed next to any rail or the game would crash.
1.6 Fixed a bug with sloped detector rails leading to opposite-sloped rails would only generate a signal for occupied carts (like a stone pressure plate).
Official release
1.5 13w10a Added a texture for detector rails when active.
Console Edition
TU1 Added detector rails.

[edit] See Also

[edit] Issues

Issues relating to "Detector Rail" are maintained on the issue tracker. Report issues there.