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Noquay - Model Railway Inglenook Layout 4mm (OO)

Glossary of Railway & Model Railway Terms

D

  • Dead Man's Handle - Automatic control which a driver must hold in (On) position against a spring. If he dies or is hurt, it is automatically released and the brakes are applied stopping the train.
  • Deck - USA term for cab floor or footplate.
  • Departure Yard - An arrangement of yard tracks from which wagons are forwarded.
  • Derail - To leave the rails. Also a fixture that is placed on a siding or spur line to prevent cars from rolling onto the mainline.
  • Diagram - Display in schematic form of track work and signals controlled by a signalbox. The display could provide illuminated indications of signal and point operation, train positions, and descriptions.
  • Diamond Stack - A tall smokestack with a spark arrestor on top, was widely used on old wood-burning locomotives. It had a diamond shaped top.
  • Diecast - A casting process used to manufacture some products for model railways, where molten metal is forced into the mold under pressure.
  • Diorama - Small highly detailed scene. A proof of concept model. A display model. Sometimes built to learn new modeling techniques in a short period of time.
  • Direct Current (DC) - Electrical current which flows only in one direction.
  • Direct Drive - A system of power transmission in which there is a direct connection between the engine or motor and the driving wheels.
  • Dispatcher - A railway employee who coordinates all train movements, usually within one division; he may issue specific orders to keep traffic moving.
  • Distant Signal - A signal (not itself a stop signal) which provides a warning to approaching trains of the state of the state of the signals or level crossing ahead. Also known as distant board, back board, backup peg.
  • Dog Bone - Model railway arrangement consisting of two reversing loops connected together. Also known as Dumb Bell.
  • Dome - A round protrusion on the boiler of a locomotive that houses the steam controls.
  • Double Track - A twin track railway.
  • Double Header - A train pulled by two locomotives.
  • Down Line - Line over which trains normally travel away from the headquarters of the railway company or most significant city.
  • Down Train - One which travels on or in the direction of the down line.
  • DPDT (Double Pole Double Throw) - This is a special switch which is used on model railways to allow you to change the polarity of the current for reverse loops, or complex block control.
  • Drawbar - The bar that connects the locomotive and its tender.
  • Driving Gear - The group of rods and cranks which transfer the piston energy to the driving wheels.
  • Driving Wheels - The large wheels of a steam locomotive connected by rods; And the motorized wheels on electric or diesel locomotives.
  • Drop Side - Type of wagon where the vertical side is hinged horizontally and can be lowered to facilitate loading and unloading.
  • Dry Brush - A modeling technique where a paint brush is used to accent highlights of a model. This is acomplished by using a light color paint and first removing most of the paint on a paper towel. You then drag the brush across the models surface leaving small amounts of paint on the highlights.
  • Dual Gauge - Track able to accommodate trains of two different wheel gauges. Usually achieved by the laying of a third length of rail, one being common to both gauges. Very common in Europe, and in model railways in the U.S. such as HO and HON3.
  • Duckunder - An area on a layout where you must bend down and go under the bench work to gain access to another part of the layout.
  • Dynamic Braking - A system that uses a locomotives traction motors as a generator which acts as an additional braking system.