Re: Simple Question.....

[krel4203@netconnect.com.au (Kevin and Rita Lawrence)]

On 3 Jan 1998 11:00:54 GMT, "Michael Alexander" <malex@bigfoot.com>
wrote:

>>  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)
>
>
AFAIK where there is a visibilty problem for single light signals on
LT the previous signal has two lights and shows aspects as per NSW
practice. This is unusual as most overseas railways seem to use the
speed signalling system similar to that used in Vic and SA.

Cheers Krel.