On Mon, 14 Jun 2010, David Cantrell wrote:

On Sat, Jun 12, 2010 at 12:41:52AM +0100, Clive wrote:
In message , simon
writes
On NR lines where LU trains run, their rules
state that it's the normal line speed, unless there's a lower speed
for station limits.
Why should lines within station limits be lower than in the section?

Presumably because, if in normal use trains are expected to always stop
there, and so only run at a very low speed, there's no point spending
extra money on building the track to a needlessly high quality. Same
reason that the road outside my house doesn't have as good a surface as
a motorway does: to build a suburban side street to motorway standards
would be a waste of money.

Also, if your street is reached by turning off another road, chances are
the radius of that turn is much smaller than you'd find on any motorway,
so that even if it was surfaced with deluxe super-tarmac, you still
couldn't go fast on it. Stations have similar physical constraints, with
tracks typically jiggling about more than on plain line.

tom

--
There are about 62 Lego bricks per person of the Earth's population.