DCC Bus
Heavy-gauge copper wire used to distribute the electrical power from the booster around the layout.

Deadhead
A car or train, usually passenger, moving empty; a passenger traveling on a pass.

Decal
A type of lettering material for models.

Deck
A bridge floor which may be either ballasted or open (with the track bolted to the supports).

Decoder
In DCC, small circuit board that receives digital packets of information addressed to it by the command station in accordance with NMRA standards. Mobile decoders are mounted inside locomotives and control the motor, lights, and sounds. Accessory decoders are used to control non-locomotive items such as turnout motors, signals, etc.

Derail
A safety device placed on the track, usually on a siding, to prevent cars from rolling onto the main line.

Digital Command Control
Method of controlling multiple trains and accessories using digital communications packets to send commands.

Direct Current
Electrical current that flows in only one direction.

Double Crossover
Adjacent trailing and facing-point crossovers allowing trains to pass from one parallel track to the other in either direction.

Doubleheader
A train pulled by two locomotives, each with an engine crew, as opposed to diesel or electric locomotive units operating in multiple as a single locomotive with one crew.

DPDT
Double-pole, double-throw. Switch used on model railroads to allow you to change the polarity of the current for reverse loops or for complex block control.

Draft Gear
The mechanism which connects the coupler to the frame of the car.

Drawbridge
A movable bridge that spans a navigable waterway.

Duckunder
A passage underneath layout benchwork requiring ducking or crawling to reach another part of the layout.

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