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Shielding 750 volt 3rd rail ?
In article , Richard J.
wrote: Michael Bell wrote: It has always seemed to me that the 750 volt 3rd rail is a bad idea. snip So I have been thinking of the possibilities of shielding the 3rd rail. snip Other people have designed such systems too. There is one already in operation in London - the DLR. To complete this would obviously be a 10 or 20 year project, (even longer to replace some of the longer-lived stock with higher voltage stock) but some of the benefits, such as no icing in winter, would come immediately. Your design includes a plastic cover over the top of the rail. Doesn't this prevent existing stock from using rails fitted with your plastic covers? I don't understand how you intend to operate during the 10-20 year conversion period. Obviously the fleet has to be modified first. That's the smallest part of the job! Also, have you done any sort of cost-benefit analysis for this project? No, I have done no cost-benefit analyis. But if DLR (which I should have thought of) have done it, and foreign systems have done it, then they must have made some sort of calculation. -- Michael |
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Shielding 750 volt 3rd rail ?
Michael Bell wrote:
In article , Richard J. wrote: Michael Bell wrote: It has always seemed to me that the 750 volt 3rd rail is a bad idea. snip So I have been thinking of the possibilities of shielding the 3rd rail. snip Other people have designed such systems too. There is one already in operation in London - the DLR. To complete this would obviously be a 10 or 20 year project, (even longer to replace some of the longer-lived stock with higher voltage stock) but some of the benefits, such as no icing in winter, would come immediately. Your design includes a plastic cover over the top of the rail. Doesn't this prevent existing stock from using rails fitted with your plastic covers? I don't understand how you intend to operate during the 10-20 year conversion period. Obviously the fleet has to be modified first. That's the smallest part of the job! Ah, so the fleet is modified in such a way that it can use both the old and the new design of rail. Not exactly a trivial task. Also, have you done any sort of cost-benefit analysis for this project? No, I have done no cost-benefit analyis. So you have proposed an expensive project for safety reasons which HSE don't consider mandatory, with no analysis of whether it's worth spending the money. I think you need to justify it better than that. But if DLR (which I should have thought of) have done it, and foreign systems have done it, then they must have made some sort of calculation. DLR did it AFAIK because by then it was mandatory for new systems. The fact that HSE did not mandate changing existing networks suggests that this would not produce a reasonable cost-benefit. -- Richard J. (to e-mail me, swap uk and yon in address) |
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