Re: Stop me before I make (another) mistake. now frogs...

[Landon Solomon]

Spring Creek, _just_ east of 75 in North Plano.  I have yet to do it but 
one night I'm gonna to take out and walk the line just to see what's still 
around.  :]

Trot, the semi-nocturnal, fox...

At 01:46 PM 10/31/02, you wrote:
I am up around Van Alstyne, Between Sherman and McKinney, can you tell me
where abouts this is, so I can take a look
Clint




  /\_/\   TrotFox \ Always remember,
 ( o o ) AKA Landon Solomon\ "There is a
  >\_/< [EMAIL PROTECTED] \ third alternative."

Re: Stop me before I make (another) mistake. now frogs...

[Clint D]

I am up around Van Alstyne, Between Sherman and McKinney, can you tell me
where abouts this is, so I can take a look
Clint

- Original Message -
From: "Landon Solomon" <[EMAIL PROTECTED]>
To: "Multiple recipients of sslivesteam" <[EMAIL PROTECTED]>
Sent: Thursday, October 31, 2002 12:49 PM
Subject: Re: Stop me before I make (another) mistake. now frogs...


> Just outside my apt community is an old un-used interurban line that used
> to connect Dallas with Sherman.  Next to the exit for my complex you find
> this...
>
> http://gold.mylargescale.com/TrotFox/pix/track/frog1.JPG
> http://gold.mylargescale.com/TrotFox/pix/track/frog2.JPG
>
> There's more photos of pieces of this turnout and track at;
>
> http://gold.mylargescale.com/TrotFox/pix/track
>
> I can provide more photos if you need them.  :)
>
> Trot, the snappy, fox...
>
> At 10:28 AM 10/31/02, Kevin Strong wrote:
> >These switches aren't limited to mainline high speed use, either. The
> >narrow gauge East Broad Top had two such sprung frogs on a siding.
> >Curiously, these two switches seem to be the only two on the railroad,
> >at least that the adventurous explorers have found under the leaves and
> >underbrush. Why they were on this one particular siding, and not
> >anywhere else is somewhat of a mystery.
> >
> >They only sprung closed on the mainline side of things, not on both.
> >This siding was a very commonly used siding as well. One theory goes
> >that the frog was sprung because both ends of the siding were on an
> >uphill grade, and the locomotives working hard uphill had a tendency to
> >hunt the rails. Seems the most plausible explanation, but then the EBT
> >had lots of sidings on grades.
> >
> >Still, the point is that they show up in the most curious of places.
> >Now, all I have to do is figure out how to build one in 1:20.3.
> >
> >Later,
> >
> >K
>
>
>/\_/\   TrotFox \ Always remember,
>   ( o o ) AKA Landon Solomon\ "There is a
>>\_/< [EMAIL PROTECTED] \ third alternative."
>
 

Re: Stop me before I make (another) mistake. now frogs...

[Landon Solomon]

Just outside my apt community is an old un-used interurban line that used 
to connect Dallas with Sherman.  Next to the exit for my complex you find 
this...

http://gold.mylargescale.com/TrotFox/pix/track/frog1.JPG
http://gold.mylargescale.com/TrotFox/pix/track/frog2.JPG

There's more photos of pieces of this turnout and track at;

http://gold.mylargescale.com/TrotFox/pix/track

I can provide more photos if you need them.  :)

Trot, the snappy, fox...

At 10:28 AM 10/31/02, Kevin Strong wrote:
These switches aren't limited to mainline high speed use, either. The
narrow gauge East Broad Top had two such sprung frogs on a siding.
Curiously, these two switches seem to be the only two on the railroad,
at least that the adventurous explorers have found under the leaves and
underbrush. Why they were on this one particular siding, and not
anywhere else is somewhat of a mystery.

They only sprung closed on the mainline side of things, not on both.
This siding was a very commonly used siding as well. One theory goes
that the frog was sprung because both ends of the siding were on an
uphill grade, and the locomotives working hard uphill had a tendency to
hunt the rails. Seems the most plausible explanation, but then the EBT
had lots of sidings on grades.

Still, the point is that they show up in the most curious of places.
Now, all I have to do is figure out how to build one in 1:20.3.

Later,

K



  /\_/\   TrotFox \ Always remember,
 ( o o ) AKA Landon Solomon\ "There is a
  >\_/< [EMAIL PROTECTED] \ third alternative."

Re: Stop me before I make (another) mistake. now frogs...

[Kevin Strong]

These switches aren't limited to mainline high speed use, either. The
narrow gauge East Broad Top had two such sprung frogs on a siding.
Curiously, these two switches seem to be the only two on the railroad,
at least that the adventurous explorers have found under the leaves and
underbrush. Why they were on this one particular siding, and not
anywhere else is somewhat of a mystery.

They only sprung closed on the mainline side of things, not on both.
This siding was a very commonly used siding as well. One theory goes
that the frog was sprung because both ends of the siding were on an
uphill grade, and the locomotives working hard uphill had a tendency to
hunt the rails. Seems the most plausible explanation, but then the EBT
had lots of sidings on grades.

Still, the point is that they show up in the most curious of places.
Now, all I have to do is figure out how to build one in 1:20.3.

Later,

K 

Re: Stop me before I make (another) mistake. now frogs...

[Gary Broeder]

-

> Gary
>
> Just remember that most prototype turnouts above #16 have frogs that close
> off the "unselected" route by moving the closure rail against the point.

True Jim,

These were called "spring rail frogs" and are in use even on the "sharp" #7
sidings at the grain bins here in town providing a smooth ride for Amtrak's
Coast Starlight. There were also double spring rail frogs that would provide
a smooth route both ways.


Gary B
 

Re: Stop me before I make (another) mistake ...

[Robb and Cheryl]

Dave,
I have sixteen foot radius curves.  I used #8 frog switches.  They work
out to be about the same curve.
I believe that on prototype railroads the max speed through the 
diverting route is twice the frog # in MPH.  So a #12 switch will give 
you about 24 MPH.  That is why they are going to #20 and larger movable 
frog switches.
Robb in Michigan



Dave Cole wrote:


After drawing an arc for a wide curve (almost 12 feet) on the benchwork 
and using the bent-stick method of obtaining an easement (transition), I 
find that the curve appears to be 5 degrees off the tangent.

Re: Stop me before I make (another) mistake ...

[Jim Stapleton]

Gary

Just remember that most prototype turnouts above #16 have frogs that close
off the "unselected" route by moving the closure rail against the point.
This is functionally equivalent to the old HO Tru-Scale switches, (still
available in HO,S, and O).  In fact, their current catolog lists #24s in HO
and #16s in S.  Scary.  My current layout has 24ft min radius, and #10s
work for everything, including Asters entering a passing track at "Warp
Lionel"; my wife's expression for Asterholics who run at full throttle.

Jim Stapleton
==
>Ouch,  a # 12 ( 4.46 dg)   frog will be interesting. Never done one that big
>(small in degrees)  Done lots of # 10s which work out to about 25 foot
>radius. 
==SNIP
>As a point of interest here  some real turnouts used #24 frogs with a lead
>distance of 185 feet and a radius of 5600 feet!
>
>
>Gary Broeder

Jim & Jo Anne Stapleton
Purcellville  VA
[EMAIL PROTECTED]
[EMAIL PROTECTED] 

Re: Stop me before I make (another) mistake ...

[Gary Broeder]

Dave,

Ouch,  a # 12 ( 4.46 dg)   frog will be interesting. Never done one that big
(small in degrees)  Done lots of # 10s which work out to about 25 foot
radius. To build this turnout  (even for the shortest version which would
have used an 18 foot point rail in prototype) the point-to-frog half point
"lead" will need to be 34 real inches with a closure rail radius of 29. 2
feet.

As a point of interest here  some real turnouts used #24 frogs with a lead
distance of 185 feet and a radius of 5600 feet!


Gary Broeder


>
> I'm ordering a frog and points to build a switch and I want to make
> sure: according to my calculations, 5 degrees should be a No. 12 frog
> and points.

 

Stop me before I make (another) mistake ...

[Dave Cole]

Gang:

I've been silent about the progress of the GT&E because of potential 
jinxes, but I'm at the point where I need some help.

After drawing an arc for a wide curve (almost 12 feet) on the 
benchwork and using the bent-stick method of obtaining an easement 
(transition), I find that the curve appears to be 5 degrees off the 
tangent.

The design has the tangent rail continuing and, using a turnout, the 
potential to go left onto the curve.

I'm ordering a frog and points to build a switch and I want to make 
sure: according to my calculations, 5 degrees should be a No. 12 frog 
and points.

If this is as clear as mud, I'll try again.

Thanks.

\dmc

--
^^^
Dave Cole
Gen'l Sup't:  Grand Teton & Everglades Steam Excursion Co.
  Pacifica, Calif. USA  
List Mom: sslivesteam, the list of small-scale live steamers
  

^^^