Post by Nortube on Apr 25, 2017 8:57:38 GMT
I was reading the introduction to the "London to Brighton Speed Run 11/9/05"
on YouTube:
Part of the text stated:
" Network Rail held other trains as necessary to give the record breaker green signals all the way. A few of the speed restrictions were eased as well as the grids in Brighton station itself."
Surely a speed restriction is a speed restriction? Presumably a speed restriction and its associated speed has been put there for a purpose, so how do circumstances suddenly change so that the speed can be increased as a one-off?
There are only two ways that I can think of:
Where there is a Permanent Speed Restriction purely for signalling reasons and the fact that other trains are being held elsewhere means that, as there is no risk of collision, then the PSR speed can be increased. However, that doesn't make sense as normal signalling should always take trains' positions into account
or
An overall 'maximum line speed' PSR has had its speed increased as a one-off
on YouTube:
Part of the text stated:
" Network Rail held other trains as necessary to give the record breaker green signals all the way. A few of the speed restrictions were eased as well as the grids in Brighton station itself."
Surely a speed restriction is a speed restriction? Presumably a speed restriction and its associated speed has been put there for a purpose, so how do circumstances suddenly change so that the speed can be increased as a one-off?
There are only two ways that I can think of:
Where there is a Permanent Speed Restriction purely for signalling reasons and the fact that other trains are being held elsewhere means that, as there is no risk of collision, then the PSR speed can be increased. However, that doesn't make sense as normal signalling should always take trains' positions into account
or
An overall 'maximum line speed' PSR has had its speed increased as a one-off