Guys I need to build a bridge across a gap 8ft wide. I would like it to carry two tracks. The type that I have in mind has “lattice” towers supporting, what I would describe as 3 Girder bridges.
The question is, is this prototypical ?
Thanks
A bridge that carries two tracks is certainly prototypical. The span???. Multiply eight feet by your scale, then decide. Likely, it will be.
Rod if you look here you can maybe get some ideas click on each number a pic. comes up http://www.eaglewingsironcraft.com/bridges.php
Just double the width plus clearances. I think the following is your style…
John
I think you nailed it, John.
That’s the one John. But, were they ever double track?
Yes, but …
My limited, yet perhaps idiot savant knowledge screamed yes, but the pragmatic fellow needed proof. It’s not a big deal to have a pair of box girders, depending on the supports. The first example has different bents.
The above had one side removed and most likely recycled elsewhere. Below is my Yes. There is an added leg in the center to support the center beams. It’s stouter, but because it’s vertical it’s not as wide as double.
You can see the second box girder from below.
Happy Rails,
John
Rod Fearnley said:
Guys I need to build a bridge across a gap 8ft wide. I would like it to carry two tracks. The type that I have in mind has “lattice” towers supporting, what I would describe as 3 Girder bridges. The question is, is this prototypical ? Thanks
Rod
Anything can be prototypical, however think of the span you need to cross and how in the 1:1 world they would cross it. Then think the load /span specs and how many supporting piers needed depending on the style bridge you choose and your terrain if you want to get prototypical.
I like to model by eye myself and what is pleasing to my likes. However if your looking into double tracked steel bridges check out the Pittsburgh PA area also look at the Wheeling and Lake Erie RR …side note “Unstoppable” was filmed in some of that area. Bridges can be mind numbing !!!
Looking forward to pics!
Oh yes. There is a plate girder deck bridge near where I lived. The second track has long since been removed, as have most the the sections that supported the track, but a few are still there. They were supported on concrete arches. It kinda odd where there is only one section of the girder bridge left, since its very off center.