A
Acrylic paint
Acrylic paint dries faster and is preferable to oil-based paint. It can be mixed with water and cleaned from tools and skin using water and soap.
Articulated Locomotive
A steam or diesel locomotive with two or more power trucks (sets of driver wheels) with separate frames connected with pivoting joints. These joints enable the locomotive to negotiate curves.
B
Block control
A system of train control that uses electrically insulated track sections to control separate trains. See Cab Control.
Bobo
Four wheeled bogies.
Boiler
That part of a steam locomotive in which water is heated and turned into steam pressure to provide energy to turn the wheels and move the train.
Bumper (buffer stop)
Stop placed at the end of a siding to prevent a car or locomotive from accidentally running past the end of the rails.
C
Cab
That part of an engine where the engineer and fireman ride while running the train. Also, a handheld controller that regulates the speed and direction of a model train.
Cab Control
A train control system in which multiple power packs or command control units are used to operate multiple trains. See Block Control.
Caboose
A non-freight car coupled to the end of a freight train and used as a rolling crew office, bunkhouse and observation point to watch the train ahead.
Can Motor
A fully or partially enclosed electric motor with low electric current draw and smooth, quiet operation.
Coco
Six wheeled bogies
Command Control
A train control system that uses electronic signals sent through the rails to a receiver in the engine to regulate engine speed, direction and other functions. It facilitates independent, multiple-train operation on the same track.
Constant Lighting
An electrical circuit that causes a locomotive's headlight to burn at the same brightness any time the engine is running.
Controller
Any device which regulates an electrically or mechanically operated machine such as a train, turnout, lights or other hardware.
Crossing
The place where a highway crosses a railroad track, or where two railroad tracks cross each other.
Crossing Gate
A pair of safety arms that automatically lower across a highway when a train approaches.
Curve Radius
The measurement from the center of a circle formed by a curved track to the centerline of the track. The radius is expressed in inches, such as an 18-inch or 24-inch radius.
D
DCC
Digital Command Control, the term that describes the hobby industry standard for command control systems for model trains.
Decoder
The electrical component installed in a locomotive that allows a command control system to regulate speed, direction and other functions.
Diesel
A locomotive that uses a diesel engine to run a generator and provide power for the engine's traction motors.
Double-Deck Layout
A layout built with two separate, independent levels, one over the other, to make double use of the space and provide more track length and running time.
Drivers
The powered wheels on a steam or diesel locomotive.
E
F
Flexi Track
Ready-to-lay track that can be used straight or bent into any curve radius to fit any track plan.
Freight Cars
  (box, tank, stock, refrigerator, flat, ore, hopper, etc.) Railroad cars designed to carry solid or liquid cargo but no passengers.
Frog
The spot in a switch where the rails come together at a point and then cross over each other.
G
Gauge
The distance between rails.
Gondola
A low-profile, open-top freight car designed to carry bulk cargo such as rock, coal, iron ore or scrap metal.
Grade
The steepness of a hill measured as a percentage. For example, a four percent grade rises four feet for every 100 feet of travel.
H
Hand Car
A small four-wheeled car with levers for propelling the car by hand and used for moving work crews to and from a railroad construction site.
Handrails
Safety railings made of round steel bars that give train crews something to hold on to while walking on an engine's or car's walkways.
Heavyweight
A heavy steel passenger car that became popular before World War I. The car was called a heavyweight because it replaced a much lighter-weight wood car.
Hopper
A tall-sided, open-top car with dumping doors in the floor designed to carry bulk commodities such as coal or iron ore
I
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J
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K
Knuckle Coupler
Also called a safety or automatic coupler, it replaced the dangerous old-style link-and-pin coupler and provides automatic coupling between train cars.
L
M
Mallet
type of articulated locomotive with two separate sets of drivers and pistons operating with high- and low-pressure steam on separate frames.
Minimum Radius
This is a measure of the sharpest (smallest) track curve radius on which a train car or engine can successfully operate.
N
Narrow Gauge
A type of railroad built with the rails closer together than the standard 4'8-1/2" gauge. These were often 3', 2'6" and 2' gauge between the rails in the U.S.
NMRA
The National Model Railroad Association, a standards and practices organization that helps model train manufacturers build universal, interchangeable train parts.
O
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P
Passenger Cars
(vista dome, observation, combine, coach, sleeper, etc.) A railroad car designed to haul passengers. A combine also hauls mail or some small amount of cargo.
Pilot Truck
Also called a pony truck, the set of two or four unpowered wheels under the front end of a steam locomotive used to help guide the engine through curves and support the front of the engine.
Power Pack
An electrical device that changes household AC current into a lower-voltage DC current suitable for model train control. See Transformer.
Pullman
A passenger car with separate compartments and seats that can be changed into sleeping bunks at night.
Q
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R
Rail Joiner
A folded metal plate used to join the ends of two pieces of rail and hold them in mechanical alignment and electrical contact. Reefer - Slang expression for refrigerator car, a boxcar-like freight car cooled by ice or a mechanical refrigeration unit and used to carry perishable foods.
S
Scale
The mathematical method to describe the size of a model in proportion to the real world. HO scale is 1:87 scale; there are 87 HO scale feet in one real foot of measurement.
Shelf Walkaround Layout
A layout built on narrow shelf-like benchwork which allows the operators to walk along and follow their trains through the scenery. See Walkaround Control.
Siding
A section of track next to the mainline track where trains can pass.
Signal
A machine which uses mechanical arms or lights to deliver information to the train engineer about track and train traffic conditions ahead.
Steam Locomotive
An early-model train engine, described using numbers such as 2-8-2 or 4-6-6-4, that uses steam pressure from its boiler to power its drivers. The numbers refer to the number of pilot or pony truck wheels, drivers and trailing truck wheels. A 2-8-2 has two pilot truck wheels, eight drivers and two trailing truck wheels. An articulated locomotive, described as a 4-6-6-4 for example, has four pilot truck wheels, two sets of six drivers each and four trailing truck wheels.
Streamlined
A train is said to be streamlined when its original shape is concealed under an aerodynamic housing or shell, like the front of an airplane, designed to smooth the train's passage through the air.
Switch (point)
An electrical control mechanism operated by hand, or another name for a kind of track section. See Turnout.
Switch Machine
An electrical, mechanical or air-powered machine used to operate the points of a turnout to direct a train along alternate routes.
Switcher (shunter)
A locomotive designed for low-speed switching work in a yard or industrial area.
T
Tender
A special car permanently coupled behind a steam engine that carries the engine's water and fuel supply, which can be wood, oil or coal.
Transformer
Another name, seldom used today, for a power pack.
Track Power Clips
Electrical connectors which usually snap into place and secure the train power wires from a power pack to the track.
Trailing Truck
The set of two, four or six normally unpowered wheels in a truck under the cab area of a steam engine, used to provide support for the back end of the engine.
Truck
A mechanical component with four, six or eight wheels that swivels and has suspension parts to support each end of a train car or locomotive.
Turnout
Also known as a switch, a turnout is a piece of track where two or sometimes three track lines separate from a single line, allowing a train to follow one of several routes.
Turntable
A short bridge-like device with a center pivot used to turn a steam or diesel locomotive end-for-end so it can operate front-end forward when it travels in the opposite direction from which it arrived.
U
Uncoupler
A mechanism mounted in the layout under the tracks or carried by the engineer and used to disconnect the couplers on two cars.
V
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W
Walkaround Control
A system of train control where the engineer follows the train around the layout while carrying a portable handheld cab.
X
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Y
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Z
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KITTLE GLOSSARY of Modelling terms.
Simply browse down the list or click on a letter to find a word of your choice.