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Wooden Bridge Question - What are these?


Lawman
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  I am in the process of building my variation of the long wooden bridge mentioned in last months railroad magazine.  My version is 10' long and has wooden clapboard sides similiar to the magazine version.  My question is:  In the cropped picture below...  What is/was the purpose of the large beams adjacent to the tracks?  In this picture they are parallel to the walkway but in other pics they are on both sides of the track.  My guess is that the would help keep the train on the bridge in the event of a derailment...  Is there another reason for them? 

 

Thanks for your time.

 

Charles

post-74-0-53690500-1430494834.jpg

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If a train derailed, my guess is it would crush those beams like matchsticks, which is why steel guide rails between the rails are normally used. I'd say it's some sort of curb for the walkway.

It does look odd, though. There are no guide rails on that particular bridge, so maybe ...

Jens

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