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Mountain 'Big Boy' Track
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 Posted: Sat Jul 7th, 2018 04:47 pm
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Steve P
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Hi,

This is the track planning portion of my project previously described in:

http://www.freerails.com/view_topic.php?id=8145&forum_id=45

Steve P

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 Posted: Sat Jul 7th, 2018 05:05 pm
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Steve P
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This is the xtrkcad image.

The turnaround is on the left, the passenger station in the center of the turnaround.
The lower left is for loco and passenger car storage.
The freight yard is the area in the lower center/left.
The timbers on the right are the 1st 16' of a 96' 'trestle' that extends across a septic field to an orchard. 
The mainline, arrival/departure and drill track extend across it.
The grade will be kept at 0% across its length. The climb will start in the orchard.

Steve P


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 Posted: Sat Jul 7th, 2018 05:22 pm
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Steve P
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Hi,

Here is a turbo CAD image of the previously mentioned trestle.
The portion of the trestle shown on the xtrkcad image is on the lower right.
It will support the main line, arrival/departure and drill tracks (left to right).
There will be several pairs of turnout switches between each to allow the switcher to cut out & assemble cars.

Steve P


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 Posted: Tue Jul 10th, 2018 04:00 pm
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Steve P
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Hi,

Here's the xtrkcad image of the trestle. 
The starting platform shown two images back is repeated on the left. 
Note that it is over 96' of track. :)

The top rail is the mainline, the middle the arrival & departure track, and the bottom the drill track. 
The a/d track is designed to hold one long consist of approx. 45 cars, or 2 shorter trains.

Steve P


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 Posted: Tue Jul 10th, 2018 04:05 pm
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Steve P
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Hi,

An image of the test layout of the freight yard/warehouse area.  Two team tracks
and a dummy warehouse, 3 1941 Chevy flatbeds.

Steve P

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 Posted: Wed Jul 18th, 2018 01:35 pm
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Steve P
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Hi,

I'm going to start gluing down track today, finally dry enough outside.

Questions:

I'm planning on using some quality caulk under the ties, is this going to work?

I have realized a new plan is necessary to handle my steep grades.  I used a transit
to determine the actual grade from end to end, and its 6.25% :sad:

To handle this I now plan on using a pair of horseshoes to fold the path back then forward again to slightly more than double the amount of track.  I can get it to 2.78% by doing this.

When I build the actual horseshoe should I keep it at 0% grade to compensate for the additional effort needed to pull cars thru the curve?
Or should I attempt to make it around 2.5% grade?

I plan on using (LGB) R5 track, 15' diameter.
Should I bank the curve, and if so, how much?

Steve P

Last edited on Wed Jul 18th, 2018 01:36 pm by Steve P

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 Posted: Thu Jul 19th, 2018 02:59 pm
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Helmut
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I doubt that any caulk will withstand the UV irradiation outside.
Years ago, I tried asphalt to glue down the ties - it was well covered with ballast but finally gave in.
So the tracks were heaved up.
Then I just put dowels in the concrete breeze forming the trough where the ballasted tracks ran in,
and fastened the ties with unobtrusive brass straps and stainless screws.
It was sufficient to have them roughly 1' apart.
Trouble ended immediately until the final trouble of being forced to dismantle the layout showed up.
No remedy for that of course.
The horseshoe curves' grade should be half of your ruling grade to compensate for friction.
Banking is definitely contraproductive in your case.
Just my 2 cts.




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 Posted: Thu Jul 19th, 2018 03:28 pm
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Steve P
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Helmut,

I am using a lifetime exterior grade caulk.  I want it to be semi removable if necessary
till I'm sure of the layout.  If sections lift I can try something else under that section.

Out of curiosity, why not some banking in the turns?

I've been told that to change grades, I should gradually change over a 6' length.
I assume I would use  "bendable" track, but how do you bend that small an arc?
I calculated that a 3% grade over 6' would be roughly a 100' radius.

Steve P

Last edited on Thu Jul 19th, 2018 03:28 pm by Steve P

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 Posted: Fri Jul 20th, 2018 04:04 pm
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Helmut
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@Steve P
In RR engineering terms, a banked curved track's outer rail is above the inner rail in order to compensate for centrifugal forces.
This is not needed in model railroading,
as it increases the risk of your cars being turned over to the inner side of the curve when pulling a long drag.
Vertical transition curve radius for grade changes, should be some 5..6 times your longest loco's wheelbase.
When using code 332 rail, bending it vertically is indeed a challenge when using ready-made track sections.
In that case I'd rather use relatively short sections, join and place them on a properly shaped bed to achieve the transition.




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 Posted: Tue Jul 24th, 2018 03:54 pm
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Steve P
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Hi,

It has occurred to me that I should be placing some sort of expansion gaps in the long lines of track,
to keep summer heat & winter cold from buckling the track. 
Is there a rule of thumb for this?

Steve P
 

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