 Line speeds
"Neil Williams" <wensleydale@pacersplace.org.uk> wrote in message
news:4865384b.870828@news....
> On Fri, 27 Jun 2008 11:41:42 -0700 (PDT), "tshanazt@"
> <tshanazt@> wrote:
>
>>I've seen some stretches of line with line speed X for HSTs and line
>>speed Y for non-HSTs. Is it ever possible to have more than two
>>variants?
>
> Yep. Parts of the WCML are 125mph for Pendolinos, 115mph for Super
> Voyagers and 90mph for everything else. This is because of the
> varying degrees of tilt.
>
> It's shown as 90 on a normal white-backed sign and 125 over 115 (or
> 115 over 125, I forget) on a yellow-backed sign, both on the same
> post.
What Neil says is correct, in practice. To be really pedantic, there is only
one "line speed" properly so-called in such cases - the two higher speeds
being "Enhanced Permitted Speeds".
> Another common one is having another one for SP - Sprinter-derived
> DMUs, which includes some of the newer ones (Turbostars for one, as
> these are effectively Sprinter-family) but definitely not the weighty
> Desiros!
These are often very considerably higher than the lower speed - the Chiltern
line between Aynho and Princes Risborough springs to mind.
Regards
Jonathan |