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prabhakar_deosthali
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Re: LED Testers ATTN : EDITOR
prabhakar_deosthali   8/19/2014 3:54:12 AM
The comment with the caption LED Testers is an AD and not a comment related to the topic of this blog.

 

Editor - Pl remove this comment.

 

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Susan Rambo
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Re: LED Testers ATTN : EDITOR
Susan Rambo   8/20/2014 3:58:32 PM
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Thanks. I removed the comment.

Max The Magnificent
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Re: LED Testers ATTN : EDITOR
Max The Magnificent   8/20/2014 4:03:40 PM
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@Susan: I removed the comment.

What comment?

DrFPGA
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Re: LED Testers ATTN : EDITOR
DrFPGA   8/29/2014 7:21:15 PM
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Thanx for spotting these. We need to make sure Max doesn't think we are removing his comments however...

prabhakar_deosthali
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CEO
can this scanning be done on line?
prabhakar_deosthali   8/19/2014 3:59:16 AM
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I was just wondering if such scanning system be fitted on all railway engines and enables the drivers to forsee any fault in the track system before the train passes over the track.

Such system will need suitable modifications to have a lase system beaming ahead in an inclined angle to be able to see the track ahead of the train and generate alert if it finds some problem with the rails, the sleepers or the track base.

Such system will be very useful in avoiding accidents due to  sudden track  failures

ChristophZ
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Re: can this scanning be done on line?
ChristophZ   8/19/2014 4:57:55 AM
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Good idea, but it will only help the next train that follows. Check the distance a fully loaded train needs to break (With 50 km/h for example).

But yes, this small size system will help to avoid accidents because more vehicels are used to measure the tracks more often.

OleAlexander
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Re: can this scanning be done on line?
OleAlexander   8/19/2014 6:29:21 AM
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Also, if every train had this device, there would be frequent samples and therefore the ability to detect trends - a certain parameter that deteriorates over time could be detected before it was actually outside of boundaries.

 

sw guy
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CEO
Re: can this scanning be done on line?
sw guy   8/19/2014 7:42:26 AM
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Not necessarily mounted on all trains, but on a number of ones.

Once you can be sure each day each section is inspected by at least one train, you can get rid of specialized engines (gain on engine cost, scheduling, ...)

dt_hayden
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CEO
Re: can this scanning be done on line?
dt_hayden   8/19/2014 9:50:04 AM
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The stopping distances are so long, given the speeds and momemntum of the trains, that the scan would have to be made way in advance of the advancing train.    However, scanning the track as it passes, to ensure safety for the next train certainly seems worthwhile.   http://www.minnesotasafetycouncil.org/facts/factsheet.cfm?qs=858251BECECF1976F908D7D68B570E85

A couple years ago I saw a panel van transiting a local highway with cameras pointed every which way.  Curious about what was being done, I caught up to the van and it was some sort of camera based highway maintenance scanner, that would look for potholes and other issues.  No idea if it was a service some agency had contracted, or just an outfit out trying to generate business.

dt_hayden
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CEO
simialr to the Lidar services
dt_hayden   8/19/2014 9:44:00 AM
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This is simialr to the Lidar services that companies like mine use, to document the physical environment and ensure adequate transmission line clearances to vegetation, terrain, and buildings.  From what I understand it is very expensive per mile of line, and the datasets are enormous.  The level of detail is quite good, although I don't have any resolusiton or accuracy specs.

This is a company that offers such services, found through a web search.  No endorsement of any kind is implied.  http://www.grwinc.com/geospatial-LiDAR.html

prabhakar_deosthali
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CEO
Pilot engines
prabhakar_deosthali   8/20/2014 1:44:25 AM
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In India , a practice is followed , whereby for the high speed passenger trains, a pilot engine runs ahead of the train to ensure that there is no track fault or any other obstruction ( natural landslides or man made obstructions ) on the track for the following train.

If such pilots ( autonomus - like those drones) are run ahead of every train a majority of possibile accedents can be avoided.

zeeglen
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Re: Pilot engines
zeeglen   8/20/2014 1:56:15 AM
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@prabhakar a pilot engine runs ahead of the train

Now that is a really good idea.


Sanjib.A
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CEO
Re: Pilot engines
Sanjib.A   8/20/2014 10:37:16 PM
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@prabhakar_deosthali: "...a pilot engine runs ahead of the train to ensure that there is no track fault or any other obstruction.."

Is that what followed in India? I do not have much idea, but I think that would be a costly affair as an engine per one high speed train would be engaged all that time just to monitor cracks. I have seen a small four wheeled cart carrying people and pushed by a couple of persons slowly on the tracks in my childhood. I believe that was used earlier to monitor the tracks manually long time back. It was done for each sections of every division...can't imagine the number of people engaged into this. Now a days I believe a specialized track monitoring car is used as shown in the link below:

http://www.rdso.indianrailways.gov.in/view_section.jsp?lang=0&id=0,2,465


With this laser based device mounted on the engines (may not be for all) of regular trains for scanning the tracks it would be possible to get rid of those special monitoring vehicles or manual effort. Also the scanning could be done much more frequently that it is currently done. Great piece of equipment.  

salbayeng
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Rookie
Eye safe?
salbayeng   8/21/2014 12:15:29 AM
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re: "Utilizing an eye-safe infrared laser (class I), "

That's certainly reassuring to know if I was lying between the tracks, looking up at a passing train that my eyes wouldn't be damaged by laser beams.

 

prabhakar_deosthali
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CEO
Re: Pilot engines
prabhakar_deosthali   8/21/2014 1:37:59 AM
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@Sanjib

 

It is true that such an option can be expensive.

This practice is followed only  for select trains running in sensitive areas where the incidents of manual disruption of rail tracks have happend in the past.

Just last month a major train accident was averted by such a pilot engine . A section of the track had been blown aprt by explosives and the pilot engine completely derailed while going over it. But it averted a major accident for the train which was to run on that track an hour later.

 

What you have seen in your childhod is right - those small inspection carts can do this job but they are slow speed and can hinder the high speed train trafiic.

 

With the kind of laser scanning talked about in this blog a simplified light weight but high spped tracking by an unmanned light vehicle can be a possible solution.

 

 

 

Sanjib.A
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CEO
Re: Pilot engines
Sanjib.A   8/21/2014 11:48:22 AM
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@prabhakar_deosthali: "...This practice is followed only  for select trains running in sensitive areas where the incidents of manual disruption of rail tracks have happend in the past..."

Okay I understand the context which you described earlier. I did not know that such arrangement was made due to unfortunate miscreants caused by anti-socials. Good to know that this practice saves many lives, for which the cost of running an extra engine for certain trains in certain areas is insignificant.

DrQuine
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CEO
Learning from Laser Scanning of Tracks
DrQuine   8/22/2014 1:43:44 PM
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I'm interested in the kind of information that the scanning system can obtain.  The image looks like a monochrome (green) image of the scene. Obviously this could be useful if the tracks had been sabotaged or suffered gross damage such as the bed being washed out by a flood, missing rail spikes, or severe physical damage to the rail. Does this technology have any value in detecting progressive material failures? Which of the failure modes that require repair can it detect? 

DrFPGA
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Blogger
Regular roadways
DrFPGA   8/29/2014 7:22:27 PM
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If we can do this for regular roadways then the robot pot hole fillers can be easily dispatched.



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