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Amazing Old Trestle (a Haupt Bridge)
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<p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: Times New Roman;"> <o:p></o:p></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-family: verdana,geneva;"><span style="font-size: small;">Here is that other bridge that I mentioned above referenced in George Abdill’s book.<span style="mso-spacerun: yes;"> </span>It is composed of just one of the unique military designed trusses that is identical to the 25 trusses used on the Farmville High Bridge as they appear in the photo linked to the preceding post.<span style="mso-spacerun: yes;"> </span>This is the Bull Run Bridge on the Orange & Alexandria RR, one of seven bridges built at this location.<span style="mso-spacerun: yes;"> </span>Six were destroyed by military action and one was washed out by the stream.<span style="mso-spacerun: yes;"> </span>Here are two photos:</span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><a href="http://www.cliftonva.us/Portals/0/brigadoon/chap4_officers_fam.jpg"><span style="font-family: verdana,geneva;"><span style="font-size: small;">http://www.cliftonva.us/Portals/0/brigadoon/chap4_officers_fam.jpg</span></span></a></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><a href="http://southern.railfan.net/ties/1958/58-12/bat5.jpg"><span style="font-family: verdana,geneva;"><span style="font-size: small;">http://southern.railfan.net/ties/1958/58-12/bat5.jpg</span></span></a></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-family: verdana,geneva;"><span style="font-size: small;">Even with these close-up shots, the truss structure is still a bit of a challenge to understand.<span style="mso-spacerun: yes;"> </span>Certainly there appear to be iron bolts and nuts.<span style="mso-spacerun: yes;"> </span>It also appears to include a pair of iron rods coming in diagonally from the sides to the top crosswise to the structure near each end.<span style="mso-spacerun: yes;"> </span>It looks like these may anchor the structure to the masonry piers.</span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-family: verdana,geneva;"><span style="font-size: small;">This design is attributed to Herman Haupt, an engineer who designed bridges for railroads in the early 1800s, and for military railroads for the Union Army during the Civil War.</span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-family: verdana,geneva;"><span style="font-size: small;">Here is a link that shows many bridge truss designs, but not specifically the one used at Bull Run Bridge and on the Farmville High Bridge.<span style="mso-spacerun: yes;"> </span>The closest truss design to that one appears to be the Burr Arch Truss.<span style="mso-spacerun: yes;"> </span>There is also one called the Haupt Truss, but even though the Bull Run and Farmville trusses were designed by Herman Haupt, those are not the same as the Haupt Truss shown here:</span></span></p> <p style="margin: 0in 0in 0pt;" class="MsoNormal"><span style="font-size: small;"><span style="font-family: verdana,geneva;"><span style="font-size: small;"> <o:p></o:p></span></span></span></p> <p><span style="font-size: 12pt; font-family: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"><a href="http://pghbridges.com/basics.htm"><span style="font-family: verdana,geneva;"><span style="font-size: small;">http://pghbridges.com/basics.htm</span></span></a></span></p>
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