Wheelset (rail transport)

wheelsetwheelsetswheel setsaxlewheel setaxlesWheelset (railroad) wheelsets (axles)broad gauge wheelsConical shape
A wheelset is the wheel–axle assembly of a railroad car.wikipedia
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Bogie

trucksbogiestruck
The frame assembly beneath each end of a car, railcar or locomotive that holds the wheelsets is called the bogie (or truck in North America).
A bogie (in some senses called a truck in North American English) is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles.

Railroad switch

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The unusually large flanges on the steel wheels guide the bogie through standard railroad switches and in addition keep the train from derailing in case the tires deflate.
A railroad car's wheels are guided along the tracks by coning of the wheels.

Rubber-tyred metro

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Rubber-tyred metros feature special wheelsets with rubber tyres outside of the special flanged steel wheels.
The bogies of the train include railway wheels with longer flanges than normal.

Derailment

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The unusually large flanges on the steel wheels guide the bogie through standard railroad switches and in addition keep the train from derailing in case the tires deflate.
The running gear — wheelsets, bogies (trucks), and suspension — may fail.

Hunting oscillation

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For more information on this process, see Hunting oscillation.
The problem does not occur on systems with a differential because the action depends on both wheels of a wheelset rotating at the same angular rate, although differentials tend to be rare, and conventional trains have their wheels fixed to the axles in pairs instead.

Bogie exchange

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The two wheel sets on four-wheel wagons can be changed as well if the wagon has been designed accordingly.

Train wheel

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A wheelset is the wheel–axle assembly of a railroad car.

Axle

axlesrear axlehalf shaft
A wheelset is the wheel–axle assembly of a railroad car.

Bay Area Rapid Transit

BARTBay Area Rapid Transit (BART)Bay Area Rapid Transit System
Some modern systems, such as Bay Area Rapid Transit (BART) in San Francisco, use cylindrical wheels and flat-topped rails; BART is now switching to conical tread to reduce the noise caused by flange/rail contact and loss of adhesion of one of the wheels on curves.
Originally utilizing flat-edge rail and wheelsets with cylindrical treads, BART is now switching to conical tread to reduce the noise caused by flange/rail contact and loss of adhesion of one of the wheels on curves.

Flat spot

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A flat spot occurs when a rail vehicle's wheelset is dragged along the rail after the wheel/axle has stopped rotating.

List of railroad truck parts

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A bogie or railroad truck holds the wheel sets of a rail vehicle.

Interference fit

press fitfriction fitPress fitting
A press fit is required to mount wheels on an axle to make a wheel set.

Luttermöller axle

LuttermöllerLMALuttermöller cogwheel axles
Steam locomotives with several axles or wheelsets connected to one another by coupling rods are not able to negotiate tight curves well.

Variable gauge

variable gauge axlesvariable gauge axletrack gauge changing facility
Although several alternatives exist, including transferring freight, replacing individual wheels and axles, truck exchange, transporter flatcars or the simple transshipment of freight or passengers, they are impractical, thus a cheap and fast system for changing gauge would be beneficial for cross-border freight traffic.

Drop table

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A drop table or wheel drop is a device used in railway engineering during maintenance jobs that require the removal of locomotive or rolling stock wheelsets.

Axle track

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In the case of a rail wheelset the "track" is called "wheel gauge" and is measured from wheel flange reference line to wheel flange reference line on the wheels of any rail car or tram.

Wheelbase

long wheelbaseaxle baseWheel base
On vehicles where the wheelsets (axles) are mounted inside the vehicle frame (mostly in steam locomotives), the wheelbase is the distance between the front-most and rear-most wheelsets.

Railroad car

railway carriagecarsrailway car
A wheelset is the wheel–axle assembly of a railroad car. Most North American freight cars have two bogies with two or three wheelsets, depending on the type of car; short freight cars generally have no bogies but instead have two wheelsets.

Railcar

rail motordiesel railcarrailbus
The frame assembly beneath each end of a car, railcar or locomotive that holds the wheelsets is called the bogie (or truck in North America).

Locomotive

locomotivesmixed trafficrailway locomotive
The frame assembly beneath each end of a car, railcar or locomotive that holds the wheelsets is called the bogie (or truck in North America).

North America

NorthNorth AmericanNA
The frame assembly beneath each end of a car, railcar or locomotive that holds the wheelsets is called the bogie (or truck in North America).

Goods wagon

freight cargoods wagonswagons
Most North American freight cars have two bogies with two or three wheelsets, depending on the type of car; short freight cars generally have no bogies but instead have two wheelsets.

Queensland Rail

Queensland RailwaysQueensland Railways DepartmentTraveltrain
Two-axle cars operating on lines with sharp curves, such as Queensland Railways, used Grovers bogies.