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Re: Simple Question.....



>  Unfortunatly, the Urban systems will always be incompatable, even if the
> unthinkable happens and we get national safeworking standards. Dual
aspect
> signalling exists due to traffic density. 

Does anybody know how London Underground manages to runs its quite
impressive density on what appears to be single aspect signalling? (Or am I
wrong)

Regards,

Mike Alexander
(malex@bigfoot.com)