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COMPARISON BETWEEN FEASIBIITY OF HIGH SPEED RAIL & ELECTROMAGNETIC RAIL IN BANGLADESH(PART-6)

HIGH SPEED RAIL TECHNOLOGY


The term "high-speed rail" does not refer to a particular type of train but, rather, simply to the speeds it can attain. Today most high-speed trains are electric, though diesel trains, incorporating newer technology, have been able to reach similar speeds. For instance, the Spanish company Talgo has a diesel train that reached 250 kilometers per hour in testing, though its trains purchased for systems around the world remain electric.

For Sustainable High-Speed Rail

KEY STONES - Major target of high-speed raiI :

First generation high-speed rail

1. Formation of high-speed rail network

2. Running stability/safety and good ride comfort


3. Speed-up  


Second generation high-speed rail 

1. Environment compatibility ( global environment and wayside environment
ex. lighter, regenerative, power distributing system). 

2. Safety for natural disasters, ex. earthquake   

Standard and specialized railway sleepers
 
RAIL.ONE track systems provides standard and specialized concrete sleepers, including wide sleepers, elastically-footed sleepers, turnout sleepers and ballastless track systems such as the top railway products RHEDA 2000® and GETRAC®.

For urban traffic, the product spectrum includes, in addition to concrete sleepers, non-ballasted track systems such as RHEDA MRT, RHEDA CITY and the 'green tracks' RHEDA CITY GREEN and ATD-G.

With locations in Germany, Hungary, South Korea, the Netherlands, China, Romania, Spain, Turkey and Saudi Arabia, RAIL.ONE produces more than 2.5 million main-track sleepers annually, in addition to more than 500,000m of turnout sleepers.

RAIL.ONE produced and delivered approximately 260,000 sleeper systems, using RHEDA 2000 technology, for the new high-speed Dutch line HSL-Zuid.


RHEDA 2000® ballestless track system

The monolithic, ballastless RHEDA 2000 system is used for mainline tracks, especially on high-speed routes. Chief characteristics of the supporting concrete slab include its lack of a trough, and its use of a modified bi-block sleeper with a lattice truss.

The development of special turnout sleepers for the RHEDA 2000 system means that track and turnout are totally compatible: the uniform structural height and the reduced weight enable significant time and cost benefits in project engineering and installation. 

As a result of the monolithic structure of the track-supporting layer and the low overall structural height, this system is suited for applications for earthwork systems, tunnels and bridges – including those designed for trains that run at speeds over 300km/h.

The use of asphalt as a track-supporting layer leads to permanent improvements in track positioning. The GETRAC® system offers an optimal cost / performance ratio.
  Figure-11

GETRAC system for concrete sleepers

The chief characteristic of GETRAC track systems is of asphalt supporting layers on which concrete sleepers directly rest. The sleepers are elastically connected to the asphalt layer by special concrete anchor blocks, which transfer the horizontal forces from the track panel to the asphalt.
A major advantage is the fast and simple installation technique with conventional track-laying technology and with high daily track-laying output.

The GETRAC A3 system is the newest and highest-performance product in the GETRAC line. The wide sleepers, an intrinsic part of this system, reduce track installation height, which makes it especially effective for tunnel installations but also for embankments.

The German Federal Bureau of Railways (EBA) has granted its approval, without speed restriction, to various track designs. This approval means that GETRAC models are cleared for high-speed rail traffic.

The ballastless track system RHEDA CITY offers more mobility and flexibility in the range of urban traffic by rail. The system is optimally integrated into traffic flow: trams, buses, cars and pedestrians all share the same track surface.

 

 

  Figure-12
Invisible rail sleeper system for urban traffic
 
The RHEDA CITY system is characterized by simple structural technology; modified bi-block sleepers with lattice trusses facilitate installation and guarantee precise track gauge at the same time. It is hardly visible, requires almost no maintenance, offers perfect ride comfort, supports heavy loads and ensures great safety.
RHEDA CITY, which is also available as a 'green track', provides additional advantages through the monolithic structure of its track-supporting layer and its low installed structural height.

The track system ATD-G is a ballastless track system, whereby a transverse sleeper section is mounted directly onto a prefabricated asphalt layer.
Figure-13
Rail track system for underground systems

The RHEDA MRT ballastless system, developed especially for applications in underground railways and surface commuter systems, easily masters high speeds and severe vibrations. Its basic principle is the same as that of RHEDA 2000, the RAIL.ONE system for high-speed applications.

Green track for urban rail traffic

The ATD-G ballastless track system has been designed for applications for trams and surface commuter railways in downtown areas. The ATD-G is primarily characterised by bi-block concrete sleepers directly supported by an asphalt layer. A lateral-force base support effectively secures the track span.

The system can be covered by turf or sedum plants, in various heights. Owing to its appealing optical impression and its favourable environmental characteristics, the RAIL.ONE 'green track' is an outstanding choice for mass rapid transit.

 Sleepers for freight and heavy-haul traffic

With high energy prices and increased demand for raw materials, freight and extreme-load railway traffic has assumed a key function in intermodal competition. For these exceptional demands placed on track technology, RAIL.ONE has developed special concrete sleepers that are designed for static axle loads up to 40t.
Power-Supply By passing 

Power-supply pins are actually inputs, and care must be taken to provide a clean, low noise, dc voltage source to these inputs. The bypass capacitors have two functions: 

• Provide a low impedance path for unwanted frequencies from the supply inputs to ground, thereby reducing the effect of noise on the supply lines. 

• Provide sufficient localized charge storage, for fast switching conditions and minimizing the voltage drop at the supply pins and the output of the amplifier. This is usually accomplished with larger electrolytic capacitors.

 

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