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Si.
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| Joined: | Thu Feb 23rd, 2012 |
| Location: | London |
| Posts: | 5245 |
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 I have wanted to include a bridge in a trackplan section for a while now.
I do like the old wooden trestles very much.
By the late '30s though, I figure most would have been replaced with steel.
I can still use the odd small-trestle perhaps somewhere or other.
I have had some difficulty in finding a suitable steel bridge kit.
I was after a through girder truss bridge, of a fairly impressive size.
Of course there is nothing available in 1:35 scale, so a large HO one is what I needed.
I kept on looking though, just couldn't find what I wanted.
Anyway, the other day I found just what I wanted.
The price was good on eBay, for what is normally a pretty costly kit.
So didn't hang about, ROW engineers were consulted about sizes etc.
10mins later we ordered some serious steel !!
Michael, this is the one I told you about, it arrived the other day.
Here's one of the 'pack shots' of what it looks like.
The span is 450mm, which in 1:35 scale, is a tad over 50-feet.
I checked out the parts, WOW what a FANTASTIC kit, gonna be fun !!
Si.
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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1
' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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W C Greene
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Cool tanker, I have one of those also. Don't overlook those older HO bridges, they might work well for an old auto bridge in 1:35.
Now, get to work....
Woodie
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It doesn't matter if you win or lose, its' how you rig the game.
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Herb Kephart
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First bridge nice, but looks a tad heavy girders to my eye (bridging the cornea)
Third one looks pretty good for the type railroad you are building.
Second picture--are you f*****g kidding --and ignoring the color even. Shame that they didn't mold it in pink plastic!
Herb
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Fix it again, Mr Gates--it still works!"
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Ken C
Registered
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Si
Another option may be a TRIANG truss bridge, length of 15 inch's. wood floor. Short on the rivet detail though.
My last truss bridge project, used two Walther's single track HO kits, lengthened to 33 inch's and widened for my On30 layout. I install 4 brass channel's in upper and lower chords to strengthen. Deflection of .003 of an inch with two OF 2-8-0s on bridge.
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Ken Clark
GWN
real men don't use instructions. they are only
the manufacturers opinion on how to put the thing together!
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Si.
Moderator
| Joined: | Thu Feb 23rd, 2012 |
| Location: | London |
| Posts: | 5245 |
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" I install 4 brass channel's in upper and lower chords to strengthen "
Hi Ken 
The truss girder bridge is a done deal at last ( I hope ! )
It's nice to know finally, what the 'footprint' will be, for incorporating into a trackplan.
I'm not going to build it right away, too many other things to spend my model making time on.
But I have given the kit a good looking over, regarding assembly, size, clearances & possible strengthening.
The main bridge profiles are made up from 2 layers each side, with girder sections between them.
Very nice, it gives the truss a highly open & realistic look.
The construction is in fact, exactly like the prototype.
I think/hope it could be quite strong once assembled.
The kit is designed specificaly for Marklin-C sectional-track.
I checked this out & it actually has a large-wedge of 'ballast' moulded onto the rail/ties part.
I guess this provides a certain amount of strength, doesn't look great though !!
Mmm...
The bridge has 2 long girders, running full length, at track level. They are NEARLY 16.5mm gauge.
It may be possible to adjust the slots these run through & replace them with a chunky rail section.
As you said, brass could be an option as well, something soldered up or channel could be the answer here.
Perhaps a mix of rail & soldered brass.
I found a few pix. of an assembled truss girder bridge, that was for sale a while back.
Here they are, I think they show the prototypical construction pretty well.
I await, with breath held...
...for Michaels assesment of the rivet-details & Herbs of the girder sections !!
Si.
P.S.
Ken. I did find out a bit more about S.C.R-throttle mods.
I finished the NEW handset a while back.
Have been modding the main circuit-board a bit now as well.
Found a nice case for the P.S.U, just got to cut a front-panel for it.
More on that soon...
...I'm going to add MORE smoothing capacitors to the output basically.
____________________
' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1
' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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Ken C
Registered
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Si
With your explanation of the construction, sound's like there should not be a problem. As I spliced two bridges of 20 inch's in length and finished up with a length of 33 inch's. The brass channel's were, I felt necessary to strengthen the butt joint.
The deck width was increased from 2&1/2 inch's to 3&1/2 inch's. Although not perfect, it comes close to the prototype, being the Norquinco River bridge on the Esquel line in Argentina.
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Ken Clark
GWN
real men don't use instructions. they are only
the manufacturers opinion on how to put the thing together!
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. . . " ZEROLENE ! "
