basics of rail transportation - kukg.bme.hu
TRANSCRIPT
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Transport technology
Basics of rail transportation
Faculty of Transportation Engineering and Vehicle Engineering
Department of Transportation Technology and Economics
Bánfi Mikló[email protected]
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Railway
• Transportation mode where the vehicles run on rails
• Rails limit the degree of freedom to one: horizontalmovement parallel with rails
• Driver can control only the acceleration of the train(parallel with rails)
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Railway
• Main types:
– Traditional railway (metal wheel – metal railcontact)
• National railway
• Tram
– Magnetic levitation technology
– Other
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Wheelset
• Truncated cone + flange
• Flange: for leading
• Cone: moving in curves (the simplestdifferential assembly)
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How trains turn
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ELEMENTS
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Elements
• Rolling stock
– Vehicle pulled or pushed on rail, installed with adequatesafety equipment, built for passenger or freight (or special) transportation (passenger car/coach/carriage –goods/freight wagon)
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Elements
• Locomotive:
– Self-propelled vehicle, built for moving otherrolling stock
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Elements
• Multiple unit
– One/more sectional self-propelled train carriages, capable of coupling with other units
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Elements
• Trainset: a group of rolling stock that is permanently or semi-permanently coupled together to form a unified set of equipment
• Train: An engine or more than one engine coupled, with or without cars, displaying markers, train staff
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Elements
Railways can be separated into:
• Open lines
• Stations
Stations are the most important part of therailway in terms of traffic control.
Stations are separated from open lines withsignals.
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Railroad switch
• A mechanical installation enabling trains to be guided from one track to another
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Elements
Structure gauge:
• The minimum height and width of the cross-section perpendicularto the track axis whichallows the safe overpassof the trains
Loadinggauge
(clearance)
Structuregauge
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TRACK GAUGES
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Track gauge
Track gauge: the distance between the innerfaces of the rail heads
(perpendicular to the track axis)
The size of the European standard gauge:
1435 mm (56,5”)
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Track gauge
• Broad gauge:
– 1524/1520 mm (60”) – former USSR, Finland (17% of the world’s rail tracks)
– 1600 mm (63”) – Brazil (ca. 4000 km), Ireland, Australia
– 1668 mm – Portugal, Spain
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Track gauge
• Narrow gauge:
– 1067 mm (42”)– Japan, majority of Africa (9%)
– 1000 mm – Brazil (ca. 23500 km), Argentina, Asia, Switzerland (mountain railways, trams, rackrailways) (7%)
– Narrower gauges – tourist trains (most common: 760 mm/30”)
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TRAIN DRIVING SYSTEMS
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Train driving systems
– Steam engine
– Electric engine
– Diesel engine
Transmissions:
– Electrical
– Mechanical
– Hidraulic
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TRAIN BRAKING SYSTEMS
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Train braking systems
• Mechanical brakes– According to the place of the friction:
• Clasp brake
• Disc brake
– According to the origin of the friction force:• Air brake
• Springforce storage
• Mechanical parking brake
• Electrical brake
• Track brake
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Non-automatic air-brakeRelease
Pressureregulator valve
Main reservoir
Brake cylinder
Brake valve
Train pipe
Atmospheric pressure
High pressure
Compressor
Air release
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Non-automatic air-brakeBraking
Pressureregulator valve
Brake valve
Compressor
Main reservoir
Brake cylinder
Train pipe
Atmospheric pressure
High pressure
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Westinghouse air-brakeRelease/Charging
Air reservoir
Triple valve
Brake cylinderAir release
Pressureregulator valve
Brake valve
Compressor
Main reservoir
Train pipe
Atmospheric pressure
High pressure
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Westinghouse air-brakeBraking
Air release
Air reservoir
Triple valve
Brake cylinder
Pressureregulator valve
Brake valve
Compressor
Main reservoir
Train pipe
Atmospheric pressure
High pressure
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COUPLING OF RAIL VEHICLES
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Buffer-and-chain coupler
400
40
0
‚Berne-square’:Safety area up to 2000 mm
Buffer
Coupler (hookand links)
Turnbuckle(screw coupling)
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STATIONS
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Stations
• Separated from open lines with signals
• The most important part of the railway interms of traffic control
• Main functions:– Supporting the transport as scheduled in the
timetable (traffic control)
– Passenger transport
– Freight transport
– Rolling stock examination
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Station tracks
Factory siding
Main (overpass)
tracksStationbuilding
Loading stand
Island platform
Lead
Storing siding
Tracks forpassenger trains
Main platformLoading track
Overtakesiding
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STATION TYPES
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Open line services
• Stops (Halts)
• Loading stands
• Intersections (delta-sidings)
• Factory siding intersections
• Passing loops
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Stop
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Loading stand
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Passing loop
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Station typesFunctions
• (Normal) station
• Passenger station
• Goods station
• Classification yard
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Station
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Passenger station
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Goods station
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Classification yards
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FREIGHT TRANSPORTATION AND SHUNTING
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Freight transportation
• The basic unit of freight transportation is thefreight wagon
• The basic unit of traffic control is the train
• Wagon flow: wagons with the sameconveyance route
• Wagons with the same destination and/orconveyance route are forming a train
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Shunting
Shunting
Shunting: separating freight wagons of a train on toone of several tracks to form new trains
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Classification yards
Freight train station with special equipments forshunting
• Flat yards
– Shunting (with coupled locomotive)
– Kicking
• Gravity yards
• Hump yards
During the shunting the brakes of the wagons are switched off!
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Shunting with coupled locomotive
• Safe method, because the wagons are coupledto the locomotive
• Stopping of the wagons is solved by thelocomotive
• Labour-intensive, slow method
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Kicking
• After accelerating the loco brakes and uncoupled wagons run free to the appropriatesiding
• Rail skates for the braking
• Lower safety level because of the free-runningof the wagons
• Higher productivity (faster)
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Gravity yards
• The wagons are pulled up to a small humpwith a gradient ca. 4-6 o/oo, then uncoupledand let down
• The wagons run free and braked with railskates at the required spot
• Safety level is the same as the shunting withtossing
• Productivity is also the same (but energyconsumption is less)
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Hump yards
• Before the classification tracks is a hill (hump) where a locomotive pushes the wagons over
• At the highest point the buffers compress and the wagons can be uncoupled
• On the classification tracks the wagons runfree and braked with special rail brakes
• Safety level is higher than at the last twomethods
• Productivity is the highest of the methods
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Longitudinal profile
Uncoupling
Highest point
Special brakesfor allowing
switching
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Longitudinal profile
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Longitudinal profile
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Dowty-retarders
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Dowty-retarders
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Thank you for your attention!