Digest 62, bridges and viaducts

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Penrhos1920
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Digest 62, bridges and viaducts

Postby Penrhos1920 » Sun Jun 11, 2017 1:21 pm

Looking at figure 8 of digest 62 there is one dimension missing in the bottom half section. What is the normal depth of ballast under the sleepers to the inside top of the brick arch?

I'm also wondering if early bridges and viaducts had lower parapet walls then the 4'6" shown. I think some were nearer 3'?
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Russ Elliott
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Re: Digest 62, bridges and viaducts

Postby Russ Elliott » Sun Jun 11, 2017 2:26 pm

Penrhos1920 wrote:I'm also wondering if early bridges and viaducts had lower parapet walls then the 4'6" shown. I think some were nearer 3'?

I would agree. The middle parapet portion of this beauty is possibly near 4' above 'deck height', but the outer portions are a lot lower.

railway_bridge_kerne.jpg
railway_bridge_kerne.jpg (144.02 KiB) Viewed 965 times


The deck on the LSWR bridge at Barnstaple is about mid-girder height, and the 'parapet' is a one-sided handrail:

http://www.cornwallrailwaysociety.org.u ... 5_orig.jpg
http://www.barnstaplehistory.com/wp-con ... bridge.jpg

Btw, the website for bridges is brantacan.co.uk


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