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Vertical Curves
Posted: Sun Dec 22, 2002 10:07 pm
by LucaZone
On alot of available routes by a variety of people that I have in my pocession, when it comes to changing from flat track to that with a slope (be it up or down), the track just changes....ther eis no vertical curve form one to the other. Its a plain angle in the track.
Extremely unrealistic.
I was just wondering why this was? is there some reason why people dont do vertical curves?
Posted: Sun Dec 22, 2002 10:21 pm
by saddletank
You need to lay several short track sections at increasing gradients, say in 0.15% or 0.3% increments, but this takes a bit of effort.
I was wondering, when the railways were built did the engineers count the gradient as commencing at the point that the vertical curve began, or at th epoint the vertical curve reached the actual gradient the line survey had plotted? So where would the gradient post go?
Posted: Sun Dec 22, 2002 10:35 pm
by LucaZone
On the profiles i have of the CTRL, theres a flat section, a vertical curve section with radius, and a gradient section.
I know how to make the vertical curves....just wondering why ive not seen anyone else do it.
Posted: Mon Dec 23, 2002 10:02 am
by mikesimpson
>I was just wondering why this was? is there some reason why people dont do vertical curves?
Laziness? Or lack of time. It takes a lot longer to place 5 10m tracks each a degree or so steeper, than to just yank a 50m length into place.
That said, some of the routes I have downloaded appear to have vertical curves nicely done.
Posted: Mon Dec 23, 2002 3:53 pm
by peterholton
The real thing: March this year, a certain Welsh coast line:
Not telephoto, not much foreshortening.
Peter
Posted: Mon Dec 23, 2002 4:01 pm
by JohnEyres
Not suprising with the state of the track on the Cambrian Coast.
Tywyn in need of repair.
Posted: Mon Dec 23, 2002 6:03 pm
by terrycunliffe
I have found that gradient changes of up to 0.6 degrees produces a nice smooth transition whilst driving (0.15 degrees per 10 meters is much better, if you have the patience that is..) jumps of more than 0.6 deg does tend to give a rather jerky appearance.
Regards,
TC
Building Manchester-Liverpool.... slowly!
Posted: Mon Dec 23, 2002 7:07 pm
by alan2
I tried to Keep some of the gradient's smooth but I have not managed it most of the time, mainly due to Space restriction's and being half asleep while laying track, at 2 am in the morning.
I will try and re-view the Gradient's in my route for the V2. MML v1
which is Peak Line v1's future.... Distant future.