RMweb Premium boxbrownie Posted October 31, 2019 RMweb Premium Share Posted October 31, 2019 13 hours ago, SHMD said: (Early) Railways don't like inclines. The incline out of Manchester Victoria, heading east, is 1 in 49 AND IS steep. If you use this gradient as a minimum and that bridge is raised only 1 foot then you would need just 49 feet either side as minimum banks up and down to the new height. Ok, add a few more feet so that the transitions are smooth and avoid any "grounding" of vehicle underslung equipment, (and some more for smooth riding of the fastest trains), but you are not looking at half a mile each side of the bridge of banking rework. Kev. I imagine a typical US freight train may well need a bit more with some being more than two miles long and over 15000 tons.......not exactly an HST or Azuma 1 Link to post Share on other sites More sharing options...
jim.snowdon Posted October 31, 2019 Share Posted October 31, 2019 44 minutes ago, boxbrownie said: I imagine a typical US freight train may well need a bit more with some being more than two miles long and over 15000 tons.......not exactly an HST or Azuma The length and weight of the train is immaterial, it is only the part that is on the up gradient that has to be lifted, and as soon as the front of the train passes over the now raised bridge, the section of train on the down gradient balances the part on the upgrade. Jim 2 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted October 31, 2019 RMweb Premium Share Posted October 31, 2019 (edited) 1 hour ago, boxbrownie said: I imagine a typical US freight train may well need a bit more with some being more than two miles long and over 15000 tons.......not exactly an HST or Azuma 13 minutes ago, jim.snowdon said: The length and weight of the train is immaterial, it is only the part that is on the up gradient that has to be lifted, and as soon as the front of the train passes over the now raised bridge, the section of train on the down gradient balances the part on the upgrade. Jim In all the film/photos of the bridge that I have seen the trains have been passenger trains. Edited October 31, 2019 by PhilJ W Link to post Share on other sites More sharing options...
RMweb Premium corneliuslundie Posted October 31, 2019 RMweb Premium Share Posted October 31, 2019 I was waiting for some vehicle to jump the orange lights and plough through the road closed signs! Most disappointing. Jonathan 2 4 Link to post Share on other sites More sharing options...
jim.snowdon Posted October 31, 2019 Share Posted October 31, 2019 3 hours ago, PhilJ W said: In all the film/photos of the bridge that I have seen the trains have been passenger trains. The point is still valid - a ton of passengers is the same as a ton of freight. Jim 1 2 Link to post Share on other sites More sharing options...
Wickham Green Posted October 31, 2019 Share Posted October 31, 2019 1 hour ago, jim.snowdon said: The point is still valid - a ton of passengers is the same as a ton of freight. Jim Yes ....... but a passenger train is normally shorter than an American freight - so might all be on the up-grade at the same time ! 1 Link to post Share on other sites More sharing options...
Grovenor Posted October 31, 2019 Share Posted October 31, 2019 But the proposed grade length is 49ft so less than one passenger car length. 1 1 Link to post Share on other sites More sharing options...
Wickham Green Posted November 1, 2019 Share Posted November 1, 2019 16 hours ago, Grovenor said: But the proposed grade length is 49ft so less than one passenger car length. That's assuming no transition .................. very uncomfortable for the passengers and very likely to ground the centre - sorry center of an 80' car ! 1 1 Link to post Share on other sites More sharing options...
RMweb Premium boxbrownie Posted November 1, 2019 RMweb Premium Share Posted November 1, 2019 21 minutes ago, Wickham Green said: That's assuming no transition .................. very uncomfortable for the passengers and very likely to ground the centre - sorry center of an 80' car ! I wouldn’t bother....... 1 Link to post Share on other sites More sharing options...
RMweb Premium Welly Posted November 1, 2019 RMweb Premium Share Posted November 1, 2019 On 30/10/2019 at 13:04, talisman56 said: The commentary on one video said they are raising the 11'8" bridge to the 'same grade' as the neighbouring level crossing, so presumably it means they are levelling out the rail line, with a slightly steeper bit the other side. They've got some scope for doing some road resurfacing now... Progress! The bridge has been raised and the first train ran over it! 8 Link to post Share on other sites More sharing options...
RMweb Gold SHMD Posted November 1, 2019 RMweb Gold Share Posted November 1, 2019 That "ballast regulator" was a new one on me - and what a wonderful job it did. So, the change in transition is not that far after all. Kev. (Are you sure they are "tamping" machines - they are not yellow!) 2 Link to post Share on other sites More sharing options...
RMweb Premium corneliuslundie Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 So just lift the bridge and insert 4 pieces of 30 thou plasticard. Simple! Fascinating. Thanks for the posts. Jonathan 2 1 5 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 21 hours ago, SHMD said: That "ballast regulator" was a new one on me - and what a wonderful job it did. So, the change in transition is not that far after all. Kev. (Are you sure they are "tamping" machines - they are not yellow!) It looks as if they just put more ballast underneath the track to raise it. Link to post Share on other sites More sharing options...
RMweb Premium boxbrownie Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 16 minutes ago, PhilJ W said: It looks as if they just put more ballast underneath the track to raise it. No point doing that as the whole reason for the exercise was to raise the clearance under the bridge....... 1 Link to post Share on other sites More sharing options...
Fat Controller Posted November 2, 2019 Share Posted November 2, 2019 18 minutes ago, PhilJ W said: It looks as if they just put more ballast underneath the track to raise it. 2 minutes ago, boxbrownie said: No point doing that as the whole reason for the exercise was to raise the clearance under the bridge....... The track on the bridge itself appeared to not be ballasted, but laid directly on to the deck. When the deck was raised, the ballast levels on either side would be too low, so more ballast would need to be laid to return it to the correct level. I'm not sure how this volume of ballast would have been laid, but I suspect it would have been dropped on top of the sleepers for the tamper (a tampler and leveller, I believe, as there appeared to be a wagon with a 'target' some distance ahead) to 'shake it down' 1 Link to post Share on other sites More sharing options...
RMweb Premium PhilJ W Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 Also in the film was the steel beam protecting the bridge and its replacement. The replacement was almost identical except that the original was bent by an impact which must have been quite severe to bend a 12" I-beam. Link to post Share on other sites More sharing options...
RMweb Premium melmerby Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 Clarifying some of the discussion about who owns what. The state owned North Carolina Railroad Company owns the track & bridge and leases usage to NS & Amtrak The City of Durham own the road and have provided all the warning signs, lights, detectors etc. 1 Link to post Share on other sites More sharing options...
RMweb Premium boxbrownie Posted November 2, 2019 RMweb Premium Share Posted November 2, 2019 34 minutes ago, Fat Controller said: The track on the bridge itself appeared to not be ballasted, but laid directly on to the deck. When the deck was raised, the ballast levels on either side would be too low, so more ballast would need to be laid to return it to the correct level. Thank you for clarifying. 1 Link to post Share on other sites More sharing options...
duncan Posted November 2, 2019 Share Posted November 2, 2019 Anyone placed a bet on when the first rent a truck hits the raised bridge ? 3 Link to post Share on other sites More sharing options...
Mark Saunders Posted November 2, 2019 Share Posted November 2, 2019 14 minutes ago, duncan said: Anyone placed a bet on when the first rent a truck hits the raised bridge ? Rather like the recently repaired parapet on the bridge over the Swale at Morton on Swale on the A684. 1 Link to post Share on other sites More sharing options...
bimble Posted November 2, 2019 Share Posted November 2, 2019 59 minutes ago, duncan said: Anyone placed a bet on when the first rent a truck hits the raised bridge ? presumably the 8" is just enough that the majority of the smaller hire box trucks just clears the bridge and it's only going to be the larger stuff that gets caught 1 Link to post Share on other sites More sharing options...
RMweb Premium kevinlms Posted November 3, 2019 RMweb Premium Share Posted November 3, 2019 (edited) 2 hours ago, duncan said: Anyone placed a bet on when the first rent a truck hits the raised bridge ? Yes, that was my thought, as the videos previously seen, show that some vehicles didn't 'just hit'! Edited November 3, 2019 by kevinlms 1 Link to post Share on other sites More sharing options...
Hobby Posted November 3, 2019 Share Posted November 3, 2019 If you go quick enough you'll get through... Same principle used by people when going through flooded roads... 3 Link to post Share on other sites More sharing options...
RMweb Premium keefer Posted November 3, 2019 RMweb Premium Share Posted November 3, 2019 Well if the height of roof-mounted air-conditioning pods is less than 8" then at least the fancy RVs might get through unscathed! 2 Link to post Share on other sites More sharing options...
Wickham Green Posted November 4, 2019 Share Posted November 4, 2019 On 01/11/2019 at 19:51, SHMD said: That "ballast regulator" was a new one on me - and what a wonderful job it did. ........... and the result could qualify for the 'When the prototype looks like a model' thread ! 1 Link to post Share on other sites More sharing options...
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