Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New Subway Control Works With WLAN

29.04.2013
With a new train control system from Siemens, the number of subway trains on a stretch of track can be doubled, which also means twice as many passengers as before.

This development is featured in the current issue of the research magazine Pictures of the Future. The solution was developed by Siemens global research, Corporate Technology (CT).



Because the concept is also suitable for retrofitting into existing stretches, the construction of costly new subway lines can be avoided or postponed. The Trainguard MT system registers the position of each train and automatically adjusts the distance to the following train.

The fixed interval between trains of about three minutes, which subways have used until now, can be reduced to as little as 80 seconds. Trainguard MT is now in operation in several major cities around the world including Beijing, Istanbul and London.

Subways are one of the major arteries of big cities and they transport millions of people every day. But subway construction is a big job. This makes it difficult to adapt subways to increasing passenger volumes. One obstacle to raising the capacity of a subway has been the fixed interval between two trains. This interval is based on maintaining the potential maximum braking distance of the following train, which is typically around one kilometer.

If it were known exactly where each train was and how fast it was going at any given moment, the interval between trains could be adjusted to match the actual required braking distance and the trains could run closer to one another. Until now, the wireless technology needed to maintain an uninterrupted flow of this type of data between the train and the control center has been lacking.

Siemens CT turned to WLAN technology and developed a solution that uses access points installed along the stretch of a subway line. Fiber-optic cables connect these access points to each other and to the control site. In this way a train can stay in contact with the control center.

The access points are placed about 250 meters apart - depending on the subway - and the WLAN communications are configured in such a way that passengers' computers and cell phones don't cause any interference. The system detects the position of a train to within a few centimeters. When a train leaves a stop, the following train gets the green light to pull in as soon as the required interval is reached. If a train brakes, the following train will automatically also be braked if necessary.

In Beijing, Trainguard MT is in operation on two new subway lines, covering a total of 31 kilometers. Every day these trains transport around one million commuters. In Istanbul Siemens retrofitted Trainguard MT into a subway line without interrupting the service.

Dr. Norbert Aschenbrenner | Siemens InnovationNews
Further information:
http://www.siemens.com/innovationnews

More articles from Transportation and Logistics:

nachricht Tool helps cities to plan electric bus routes, and calculate the benefits
09.01.2017 | International Institute for Applied Systems Analysis (IIASA)

nachricht Realistic training for extreme flight conditions
28.12.2016 | Technical University of Munich (TUM)

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Water - as the underlying driver of the Earth’s carbon cycle

17.01.2017 | Earth Sciences

Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

17.01.2017 | Materials Sciences

Smart homes will “LISTEN” to your voice

17.01.2017 | Architecture and Construction

VideoLinks
B2B-VideoLinks
More VideoLinks >>>