Templot Club Archive 2007-2020
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posted: 23 Dec 2011 13:10 from: Alan McMillan
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Does anyone have any idea how the timbering on the approaches to a turntable should look? The picture below shows what I've come up with but it looks a bit shambolic. Any suggestions gratefully received. Alan 412_230806_590000000.png  |
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posted: 23 Dec 2011 23:12 from: Tony W
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Hi Alan. The best picture I can find on the net is this one, link below, but however you try it with that arrangement it is going to be messy. http://rpmedia.ask.com/ts?u=/wikipedia/en/thumb/7/7c/RochesterAndPittsburgh2.jpg/220px-RochesterAndPittsburgh2.jpg Tony. |
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| Last edited on 23 Dec 2011 23:13 by Tony W |
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posted: 23 Dec 2011 23:31 from: Alan McMillan
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Thanks for that Tony, it looks not unlike what I've done, so maybe I'm not that far off after all! Alan |
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posted: 24 Dec 2011 15:01 from: Tony W
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Hi Alan. What they have got is rather more timbers tying the adjacent roads together than you have. If you are really stuck, save that part of the track plan as a group (box file) and post it here and I will see what I can do with it. That number of broken timbers in the four foot is not acceptable. Tony. |
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posted: 3 Jan 2012 12:06 from: Alan McMillan
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Hi Tony Thanks for your offer. Sorry I've taken so long to get back to you - we've got family here for the holidays from Italy and this is the first chance I've had to sit at the PC since before Christmas! The box file for my turntable area is attached. Thanks again Regards Alan |
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| Attachment: attach_1290_1748_Turntable_Group.box 255 | |||
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posted: 4 Jan 2012 00:00 from: Rob Manchester
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Alan, There are some nice pictures of US-Prototype turntables in the Model Railroader book on 'Locomotive Servicing Terminals' by Marty Mcguirk. They too use frogs near to the edge of the turntable pit to allow a greater number of tracks to access the turntable. The pictures won't be much help with the timbering methods as the track is covered nearly to the railhead with very fine ( ash/clinker ? ) ballast. Some useful tips in the book on modelling all types of things for servicing steam and diesel locos but bear in mind they are US in nature. I also remember seeing a picture or two of a british turntable that had the last 8 or 10 foot of track into the turntable laid in chairs bolted to a solid concrete base rather than sleepers. I will let you know if I come across the book in question. Rob |
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posted: 4 Jan 2012 10:57 from: Alan McMillan
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Thanks for your help Rob, I'm also keeping a lookout for a picture I saw about a year ago of the turntable at Lausanne (on which mine is modelled) that I might be able to glean the timbering layout from. Google Earth might also be a possibility. Regards Alan |
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posted: 4 Jan 2012 11:00 from: Alan McMillan
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Thanks for your help Rob. I've been looking at Google Earth and I've discovered that the buried in concrete option is how the SBB did it at Lausanne, so I think I'll go with that since it will be easier. Regards Alan |
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posted: 5 Jan 2012 00:22 from: Tony W
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Hi Alan. Attached is my attempt at the timbering. I don't claim this to be the only option and as has already been suggested, there is often a ring of concrete round the edge so one can't see the timbers in any case if there are any. The nice touch is that you can select the turntable track as the control and rotate it to line up with the approach tracks with the F8 key. Tony. |
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| Attachment: attach_1299_1748_Turntable_Group_retimbered.box 226 | |||
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posted: 5 Jan 2012 16:32 from: Alan McMillan
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Hi Tony Thanks for your efforts. I have discovered that the "buried in concrete" option is the one used at the Lausanne turntable, my intended prototype. I have inserted a picture of it. It would certainly be the easier option to build. Regards Alan412_051131_590000000.png  |
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posted: 5 Jan 2012 18:34 from: Nigel Brown click the date to link to this post click member name to view archived images |
The use of crossings close to the turntable edge is quite interesting, and led to the downfall of at least one CME. F.G.Smith was CME of the Highland Railway from 1911 to 1915. His "River" class of 4-6-0 mainline locomotives is often quoted as the reason for his dismissal; the Civil Engineer refused to allow them on the line, due to exceeding the then allowed loading. However, the LMS brought them back to the line with only very minor strengthening of a few bridges. Another, deeper, reason given for his dismissal was his habit of ordering things with little or no discussion with his colleagues (the underlying reason behind the River fiasco). In particular, he managed to order a turntable of just the right diameter for the crossings to lie across the ends of the table, not a good idea! | ||
| Last edited on 5 Jan 2012 18:35 by Nigel Brown |
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