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Author Topic: For once, a new way of rail-head cleaning  (Read 554 times)
stuving
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« on: October 04, 2021, 03:50:21 pm »

You'd be forgiven a degree of scepticism about any new way of getting leaves and their slippery residues off rails - we keep getting "the end of this problem is nigh" news releases followed by not a lot. This one is at least a novel idea - while it's been in development since 2015, I don't recall hearing about it before. But it's by no means obvious why it should work better than other methods.

From Sheffield University
:
Quote
  •    University of Sheffield engineers have developed a new track cleaning system to remove leaves from railway lines - an issue which costs the rail industry millions of pounds each year
  •    Pioneering technology can be deployed onboard passenger trains - the first time passenger trains have been used to clean the line anywhere in the world
  •    Trials have shown the cleaning system reduces delays, improves braking distances and is significantly more effective at removing leaves from the line than the current track cleaning methods
Delays to train services caused by leaves on the line could finally become a thing of the past, thanks to new track cleaning technology developed by engineers at the University of Sheffield.

The new rail cleaning technique, developed by a team of researchers led by Professor Roger Lewis from the University’s Department of Mechanical Engineering, uses dry ice pellets in a stream of high pressure air which freeze the leaves and then as the pellets turn back to gas they are blasted away from the railhead. ...

I'm not so sure about this statement: "The system is also much better for the environment as it uses reclaimed carbon dioxide." Rather than what?
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infoman
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« Reply #1 on: October 04, 2021, 05:52:56 pm »

radio bristol had an interview with Prof. roger Lewis on monday 4 october about the new cleaning method starts approx 17:30pm
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broadgage
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« Reply #2 on: October 04, 2021, 09:13:33 pm »

I thought that there was a shortage of carbon dioxide ?
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A proper intercity train has a minimum of 8 coaches, gangwayed throughout, with first at one end, and a full sized buffet car between first and standard.
It has space for cycles, surfboards,luggage etc.
A 5 car DMU (Diesel Multiple Unit) is not a proper inter-city train. The 5+5 and 9 car DMUs are almost as bad.
ellendune
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« Reply #3 on: October 04, 2021, 10:05:41 pm »

I thought that there was a shortage of carbon dioxide ?
Also I thought we were trying to reduce Carbon Dioxide emissions?
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PrestburyRoad
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« Reply #4 on: October 04, 2021, 10:09:47 pm »

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I thought that there was a shortage of carbon dioxide ?
I believe the shortage is food-grade carbon dioxide.  So the gas may still be readily available in less-pure form - and this might well be suitable for rail-head use.
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stuving
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« Reply #5 on: October 04, 2021, 10:38:18 pm »

I'm not so sure about this statement: "The system is also much better for the environment as it uses reclaimed carbon dioxide." Rather than what?

That was not just unclear, it was misleading. I'm sure they were saying they didn't use the CO2 from fertilizer plants, which use methane as a feedstock (and has recently been in short supply). CO2 could be called "recycled" if it comes from the atmosphere (from oxygen and nitrogen production) or captured from fermentation, for example. What I think is specious is the suggestion that this machine is uniquely capable of using such dry ice. It can hardly be rather than other dry-ice-based rail cleaners, surely?
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broadgage
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« Reply #6 on: October 05, 2021, 02:12:14 am »

Quote
I thought that there was a shortage of carbon dioxide ?
I believe the shortage is food-grade carbon dioxide.  So the gas may still be readily available in less-pure form - and this might well be suitable for rail-head use.

So far as I am aware, "dry ice" or solid carbon dioxide comes in only one grade, it is either dry ice or it is not.

Carbon dioxide in cylinders is allegedly available in food grade and in not food grade. I doubt that there is any difference. I have observed both types of carbon dioxide cylinder being filled from the same bulk tank and in similar surroundings.
The workers handling the food grade cylinders wore white coats whereas those handling the industrial cylinders wore blue overall coats, perhaps that is the difference!

Most but not all industrial carbon dioxide cylinders have an internal dip tube such that LIQUID and not vapour emerges when the valve is opened. Often used to freeze water pipes for repairs. The presence of this internal dip tube is indicated by an external white line along the length of the cylinder.
« Last Edit: October 05, 2021, 02:51:13 am by broadgage » Logged

A proper intercity train has a minimum of 8 coaches, gangwayed throughout, with first at one end, and a full sized buffet car between first and standard.
It has space for cycles, surfboards,luggage etc.
A 5 car DMU (Diesel Multiple Unit) is not a proper inter-city train. The 5+5 and 9 car DMUs are almost as bad.
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