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Environment-friendly Weed killing trains


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There are a number of threads about historic and current weedkilling trains and models thereof.  The spraying vehicles have evolved over the years, but it's not just the rolling stock.  It's a rather complex subject, but they all seem to involve spraying rather nasty chemicals onto the track and lineside.  Looking at old photos, the same coaches seem to appear in a number of liveries, suggesting it's not just the weeds that need frequent spraying, but the paintwork of the carriages themselves!

 

The global political climate is such that stuff they used to use tends to get banned as damaging to health or the environment, so current practice is bound to change again to meet changing regulatory requirements.  The Swiss it seems are experimenting with a few novel approaches such as using hot water.  The UK is trying this "Smart Weed", which was apparently due to start last month, with a couple more trains to follow in future years.  

https://www.railwaygazette.com/uk/smart-weed-system-to-improve-environmental-performance/58464.article 

https://www.railengineer.co.uk/gbrf-unveil-partnership-to-transform-railways-weed-control-maintenance/

https://www.railtech.com/infrastructure/2021/02/10/uk-rail-partners-battle-too-green-tracks-with-smart-weed-system/

 

None of the articles above show a great view of the stock/modules involved, and I don't know whether that is merely a poor choice of photos or perhaps the manufacturers trying to protect trade secrets.  I seen no reports of such trains being seen in use, although perhaps there has been slippage in the target dates reported in the media.  Does anybody know anything about this train or whether it has begun operation.

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