Jonathan Posted December 31, 2017 Share Posted December 31, 2017 I want to lay 4mm rail across my Brunel timber viaduct. A temporary fix was a length of flexi track with sleepers attached but now I want to make it prototypical with the rails mounted on longitudinal timber baulks as per the attached photograph of Venn's Cross Waterrow Viaduct on the Barnstaple West to Taunton line. Has anyone done this please? Am assuming lengths of rail with chairs attached. obviously being very accurately laid on top of the baulks. Jonathan Link to post Share on other sites More sharing options...
Jonathan Posted December 31, 2017 Author Share Posted December 31, 2017 Looks like my photo did not upload so trying again! Link to post Share on other sites More sharing options...
Gordon A Posted December 31, 2017 Share Posted December 31, 2017 I suggest you make or adapt a jig to lay the first rail centrally on the baulk, then gauge the second rail using standard track gauges. Depending what your baulks are made of use C&L (or Exactoscale from same) chairs glued to the baulks - assuming by 4mm you mean 4mm scale.. Gordon A Link to post Share on other sites More sharing options...
Jonathan Posted December 31, 2017 Author Share Posted December 31, 2017 I suggest you make or adapt a jig to lay the first rail centrally on the baulk, then gauge the second rail using standard track gauges. Depending what your baulks are made of use C&L (or Exactoscale from same) chairs glued to the baulks - assuming by 4mm you mean 4mm scale.. Gordon A Many thanks for your reply. That is what I will do. Jonathan Link to post Share on other sites More sharing options...
66C Posted December 31, 2017 Share Posted December 31, 2017 I want to lay 4mm rail across my Brunel timber viaduct. A temporary fix was a length of flexi track with sleepers attached but now I want to make it prototypical with the rails mounted on longitudinal timber baulks as per the attached photograph of Venn's Cross Waterrow Viaduct on the Barnstaple West to Taunton line. Has anyone done this please? Am assuming lengths of rail with chairs attached. obviously being very accurately laid on top of the baulks. Jonathan Hi Jonathan I think it is normal practice to use bridge chairs for securing bullhead rail on timber baulks. Bridge chairs have the fixing bolts closer to the rail than normal 2 or 3 bolt chairs and so the bolts would not be as close to the edge of the timbers. Your photograph shows the timbers surrounded by stone chips - I do not think that a timber viaduct would have ballast when used by railway track. Regards. Link to post Share on other sites More sharing options...
Gordon A Posted December 31, 2017 Share Posted December 31, 2017 https://www.amazon.co.uk/Brunels-Timber-Bridges-Viaducts-Brian/dp/0711032181 This book may be of use / interest? Gordon A Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted December 31, 2017 RMweb Premium Share Posted December 31, 2017 (edited) Royal Albert Bridge: Old https://s-media-cache-ak0.pinimg.com/originals/d6/ea/56/d6ea56f67659a2d801b6a5a65e11fc39.jpg New http://www.railsafetysolutions.com/wp-content/uploads/2017/03/picture-1.jpg Keith Edited December 31, 2017 by melmerby Link to post Share on other sites More sharing options...
Jonathan Posted December 31, 2017 Author Share Posted December 31, 2017 Royal Albert Bridge: Old https://s-media-cache-ak0.pinimg.com/originals/d6/ea/56/d6ea56f67659a2d801b6a5a65e11fc39.jpg New http://www.railsafetysolutions.com/wp-content/uploads/2017/03/picture-1.jpg Keith Many thanks. Jonathan Hi Jonathan I think it is normal practice to use bridge chairs for securing bullhead rail on timber baulks. Bridge chairs have the fixing bolts closer to the rail than normal 2 or 3 bolt chairs and so the bolts would not be as close to the edge of the timbers. Your photograph shows the timbers surrounded by stone chips - I do not think that a timber viaduct would have ballast when used by railway track. Regards. Many thanks. Jonathan Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted December 31, 2017 RMweb Premium Share Posted December 31, 2017 Many thanks. Jonathan Many thanks. Jonathan I know that the RA bridge was not wood but I posted to show the difference in practice between the original baulk road and the more modern version over the bridge. Link to post Share on other sites More sharing options...
RMweb Premium Siberian Snooper Posted December 31, 2017 RMweb Premium Share Posted December 31, 2017 Brunel's timber viaducts had ballast troughs. I am in the process of reading a book on the subject. I would lay one rail centrally down the baulk using a straight edge and then use gauges to lay the other one. Bridge chairs are what are normally used. Link to post Share on other sites More sharing options...
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