The bridge and tunnel thread

[primavw]

My N Scale version is full size, but I had to reverse and sharpen the curve to fit my layout:

How did you build this? Is it styrene or plaster or....? I'm working on a concrete highway overpass. I cast separate pieces of from Hydrocal and am wondering if the results will be convincing enough.

[DKS]

How did you build this? Is it styrene or plaster or....? I'm working on a concrete highway overpass. I cast separate pieces of from Hydrocal and am wondering if the results will be convincing enough.

https://www.therailwire.net/forum/index.php?topic=27494.msg282403#msg282403

https://www.therailwire.net/forum/index.php?topic=27972.msg289766#msg289766

[Baronjutter]

Wow looks good for 3d printing.  I guess for something so simple/smooth it would be easy to clean up.  I should think about looking at printing for similar objects.

[wm3798]

How about a highway bridge?


The steel beam bridge in Cumberland.


































To summarize, bridges and tunnels help establish locale like few other features.

Lee

[R L Smith]

Haven't seen any covered bridges yet, so here's my contribution from my previous layout.  Hard to believe it's been 5 years since it was scrapped.











The Fisher Bridge was an STS kit.  The Cambridge Junction bridge was a styrene mockup that was never replaced with a better model, but served its purpose.

Ron

[PGE_Modeller]

From a long time ago, the N-scale bridge in this photo - a model of Pacific Great Eastern's 470 feet side-hill bridge over a dry slide in the Cheakamus Canyon 18.1 miles North of Squamish, BC - was built back in 1975 (39 years ago!!) as part of a 12' X 40' portable layout built by the Vancouver Area N-Scalers, the forerunner of today's Vancouver TraiN Gang.  The bridge was scratchbuilt from styrene sheet, the piers and abutments are balsa wood with a very thin plaster wash.  The talus slope is broken plaster allowed to roll down the hill and find its own resting place.   In keeping with the rest of the layout at that time, the track on the bridge is Code 70 rail soldered to PC ties.  A re-build to Code 40 rail is in progress. 
 


In the prototype photo, the locomotive is #57, a low-drivered (51") Mikado built by Canadian Locomotive Company in 1920 while the model photo shows a Bachmann Consolidation that has been slightly modified to represent #54, a 1914 CLC product.

Cheers,

[BCR 570]

Wow looks good for 3d printing.  I guess for something so simple/smooth it would be easy to clean up.  I should think about looking at printing for similar objects.

Yes, 3D printed in three pieces by friend Kevin Knox.

Tim

[BCR 570]

Another PGE modeller David Morgan asked me to post this photograph of yet another B.C. bridge to the thread.  This is the PGE's Mamquam River bridge just north of Squamish, on the way up to the bridge modelled above by Greg.  The prototype was a former CPR truss span with timber approaches installed in 1962.  David kitbashed his model from the Central Valley kit.  The train is led by a Bachmann 70-Ton diesel:




Tim

[DKS]

Two for one: from 1999-ish, a scrachbuilt, über-mundane concrete arch bridge, and two-track tunnel bashed from two singles.





Then we have this road overpass, based on a real one in West Trenton, NJ. It was one of my favorites, because it's only half a bridge--there are two mirrors under it to extend the road well past where layout met wall. (Two mirrors were needed because the bridge is actually skewed.)



There's a hideously boring deck plate girder bridge partially visible behind the left edge of the green-windowed factory...



..as well as another deck plate girder barely visible in the foreground--



And finally we have a through plate girder bridge, again based on one in West Trenton, that used to reside on the layout shown above (which BTW appears in the 2000 issue of GMR), and now resides on a diorama:

[tappertrainman]

Another PGE modeller David Morgan asked me to post this photograph of yet another B.C. bridge to the thread.  This is the PGE's Mamquam River bridge just north of Squamish, on the way up to the bridge modelled above by Greg.  The prototype was a former CPR truss span with timber approaches installed in 1962.  David kitbashed his model from the Central Valley kit.  The train is led by a Bachmann 70-Ton diesel:

Tim

No fair using the prototype for your backdrop! 

James

[primavw]

Nice shot!

[hegstad1]

Long story short...I tore out the large room sized layout I was building in order to do a smaller, portable layout.  The new one will have Fish Creek viaduct in Montana on one side and a yet to be determined small town on the other.  So far I have the hard shell scenery done on the fish creek side.  The first picture is the viaduct and the second is a highway bridge modeled after Schley Montana as a tradition scene through the backdrop.  As an explanation, I used rosin paper painted with white glue for the shell and I have really liked it.  Dirt cheap and easy to work with.

[Ian MacMillan]

Ian - Couple of questions as I'd like to install a similar bridge on my double mainline...

1)  Was the combining of 2 CV bridges at all difficult?  Directions say easy to build as 1 bridge, so just wondering.
2)  What mainline spacing are you using at the approaches to the bridge?

Just curious to see if I'd want the CV bridges or a couple of similar Atlas truss bridges.

Thanks,
Dave

Sorry for the huge delay.

The combining of the two CV bridges was not that hard at all. Since it is a "craftsman" style kit it is a crap ton of parts and can be adjusted to your need. The only hard part was where I have the center truss as the stringers on the top of the "half side" had to be carefully cut from the one half so that the cross members would mate up to the center truss.

I can't remember the spacing off the top of my head. Its the center line of Midwest N cork butt together in a double main.

[Power Stroke]

I have an Atlas GS&SV so there are plenty of bridges and tunnel.

I replaced the multi mfgd front tunnel portal about a year or so after building the layout, due to the fact that I actually hated it, and I changed the track routing on this section.
This is an WS 2 track portal that I had to widen due to the turn, so it took 2 portals to get it done.



Per layout instructions, 2 plate girder bridges, the "Starucca Viaduct", and a plain old deck girder bridge. I then added a WS tunnel portal modified for vehicle use, and
a RIX products road bridge to cross the "river".
Nothing but respect for Mr. Armstrong but what was he thinking when he designed this thing? I mean the river is nothing more than a creek, which in real life would only be big enough for canoe use, and there was no means of ingress or egress in the lower section, hence the mods, and I am far from done.



Per layout directions, 2 Warren truss bridges, and another plate girder.



Per layout instructions the other end of the tunnel using yet again the multi mfgd tunnel portal.



Don't get me wrong I love my layout but 6 years after building and running the Atlas N-18, I wish I had put a little more thought into it, and made changes accordingly.
Changes in the future include removing the tunnel portal, rerouting the track nearest to the viewer, which will have it moved one over under the viaduct, and replace the portals with something from Chooch or WS. I also plan to do something with the deck and truss bridges, I actually don't mind the plate girders so much.
Hindsight is 20/20.

[aikorob]

not mine, unfortunately
via a link from one of the military modeling sites
http://www.modelrailforum.com/forums/index.php?showtopic=10694&st=210