PRR Style Cut Stone Creek Culvert Offering

[DKS]

Your initial casting matches the drawing in the lower left, which indicates the design is suited for areas with "firm material," suggesting perhaps a rocky area, while the drawing in the upper left indicates it is for soft ground.

They may both seem somewhat narrow because I suspect they are meant for very small streams or gullies situated just below track grade. Imagine the track rising just above the top of the culvert: there would not be much earth to hold back.

This example may not be the PRR design, but it illustrates that there may not always be the need for large walls to hold back the earth:

http://www.flickr.com/photos/boston_public_library/4882321561/

And this--

http://www.millercountymuseum.org/archives/presidents/120924_02_StoneCulvertMileEastOfTunnel.jpg

[eric220]

I did a google image search for cut stone culverts a few days ago. Nearly every model that I saw had retaining walls. Nearly every prototype did not. I can speculate, but I'll leave it to the engineers among us to explain why.

[Kisatchie]

...Nearly every model that I saw had retaining walls. Nearly every prototype did not. I can speculate, but I'll leave it to the engineers among us to explain why.

Hmm... I'm a choo choo
engineer, and I say that
retaining walls look better...

[davefoxx]

Not your fault, but it's difficult for me to explain.  You don't have to have wing walls, depending on the soil being supported.  What I recommend is just making a wider casting, so you can bury it in the hillside so it appears to be holding the hill back without severe slopes.

This is a poor example, but in the following picture, look at how the soil slopes at roughly a forty-five degree angle from the creekbed.  It rises until it reaches the end/top of the culvert wall, where it is also the same height as the soil behind the culvert.  If you build the culvert too narrow, it would have to slope at a much steeper angle out of the creekbed unrealistically and be more susceptible to erosion.



If you look close in the first link in DKS's last post at the top of this page, you would see, if you pulled back the grass, that the retaining wall is wider than it appears to support the soil behind the culvert.

This is why I think a wider casting would be an improvement.  Otherwise, congratulations on a fine product.  I hope you sell many.

Hope this helps,
DFF

[Lemosteam]

These are for tiny streams and brooks.

This is the one with wing walls for larger, near bridge height openings as Alwyn Cutmore provided in Josh's original thread. Note that wing walls are defined on this drawing.

http://prr.railfan.net/standards/standards.cgi?plan=51224--&type=STRU

Remember the opening on these is only 8 feet....  Anyway, here's the three together:



I speculate the small ones I made could be used like this:



And the wider ones I made like this:

http://www.flickr.com/photos/kevinhooa/7237729668/sizes/k/in/photostream/

[eric220]

This is why I think a wider casting would be an improvement.

Your photo would appear to be of "soft material", for which the wider culvert is specified.  I'm really looking forward to these!

[Lemosteam]

All, I forgot to mention that the wide version is 10 feet wider than the drawing specifies, again for "planting".

[CodyO]

Stone culvert with "wings" you ask?

Here ya go on the old Laurel Line now just a nice level long quad trail just north of the old rocky glen park
The road bed is directly on top of this, was made of all fill

[Lemosteam]

Cody, can you find a PRR drawing of this style?

[brill27mcb]

The Laurel Line was an electric interurban line and was not PRR.

Rich K.

[CodyO]

I could get you dimensions of it once it warms up around here and we get back out on the ATVs
Currently still in the 30s

[Lemosteam]

Cody, I think you missed the point- that's not a PRR proto as brill27mcb points out.  The PRR did not make anything without an engineering or architectural drawing.

[CodyO]

Oh thought you where just looking for a culvert with wings

[Lemosteam]

No biggie Cody, some were wondering that the small culvert should have wings and the drawing simply does not specify any.

[Chris333]

Not sure if this is considered a culvert, but it is PRR:
https://picasaweb.google.com/ErieChris333/ProtoPhotos#5065572602102782610
https://picasaweb.google.com/ErieChris333/ProtoPhotos#5065572666527292066
https://picasaweb.google.com/ErieChris333/ProtoPhotos#5065572812556180162
http://binged.it/13pZ5xt