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posted: 23 Jun 2009 12:16 from: Andy G click the date to link to this post click member name to view archived images |
I had intended to post this once the layout design was entirely complete, however, Martin has offered to draw the irregular single slip for me and needs the box file. I'll start with the complete box file and then post the partial one that Martin is after. You can read the full explanation of the redesign here Rebirth of Slattocks Junctions on RMWeb. |
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Attachment: attach_576_877_slattocks_junction_09_06_20_2115_18.box 413 | |||
posted: 23 Jun 2009 12:18 from: Andy G click the date to link to this post click member name to view archived images |
And now the slip in context. The slip needs to allow movements from the up main (lower track) to the down main. The tandem is in the goods yard and the turnout with no timbers is part of the double junction. |
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Attachment: attach_577_877_Slattocks_Slip_Area.box 393 | |||
posted: 23 Jun 2009 12:19 from: Andy G click the date to link to this post click member name to view archived images |
And now just the slip templates. Thanks for this help Martin. Regards Andy |
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Attachment: attach_578_877_Slattocks_Slip.box 357 | |||
posted: 23 Jun 2009 13:33 from: Martin Wynne
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Hi Andy, Thanks for uploading the files. I will get on with creating the irregular slip for you. However, I have had a quick look and I'm not sure I would do it that way. If you change the B-8 part of the tandem to B-8.75 you can have a regular 1:7 curved single slip making a good fit. I think this would be a lot more prototypical than the irregular slip (and you then get a slightly easier radius in the slip road). It means moving the B-7 turnout about 35mm to the left, so I don't know how that would fit -- there is room to the next turnout (just) but you may have a board joint there. If you are tight for space there, it might be possible to shorten the lead on the turnout by increasing the entry straight on the crossing. regards, Martin. |
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posted: 23 Jun 2009 15:19 from: Andy G click the date to link to this post click member name to view archived images |
Hi Martin, Thanks for the suggestion. I've had a good look at it and tried a few things. In trying to avoid a very short section of plain track between the crossing and the junction I'm not able to get a smooth line from the crossing to the tandem. This is actually the way I had originally done it with a regular slip but Dick commented that there was a dog leg in it and that the straight path would actually give a better alignment which it did seem to. If I introduce the short length (about four sleepers worth!) then I can get an alignment as you suggested, however pushing the other turnouts out moves the loop turnout which I've already built (oops jumped the gun!). Cheers Andy |
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posted: 25 Jun 2009 00:43 from: Martin Wynne
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Andy G wrote:This is actually the way I had originally done it with a regular slip but Dick commented that there was a dog leg in it and that the straight path would actually give a better alignment which it did seem to. If I introduce the short length (about four sleepers worth!) then I can get an alignment as you suggested, however pushing the other turnouts out moves the loop turnout which I've already built (oops jumped the gun!).Hi Andy, The standard sizes for bullhead slips are 7, 7.1/2 and 8 (with fixed K-crossings). I think it's extremely unlikely that an irregular single slip would be designed for this location. It's more likely that any special work would be done in the tandem, to allow standard sizes to be used in the running lines for much easier maintenance. So I changed the left half of the tandem to B-8.3/4, and then got a smooth line across the slip at 1:7 regular, without dog-legs. It does push the B-7 turnout further left, but there is room to build the switch into the V-crossing of the loop turnout if that can't be moved. Here's a screenshot. The .box file is attached. Add file... over your existing plan and see what you think (it's not finished, no slip road yet or timber shoving, and the tandem needs some re-work): slattocks_junc_mod_a.png slattocks_junc_mod_b.png I'll get on with the irregular diamond for the double-junction (a typical location for an irregular diamond). regards, Martin. |
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Attachment: attach_579_877_slattocks_junction_mods_a.box 374 | |||
posted: 25 Jun 2009 10:44 from: Andy G click the date to link to this post click member name to view archived images |
Martin, Thanks for this, I'll have a look at it. No need to do the irregular crossing as Dick is going to draw it out and build it, so I'm leaving him to it. Cheers Andy |
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posted: 25 Jun 2009 14:51 from: Martin Wynne
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Andy G wrote: No need to do the irregular crossing as Dick is going to draw it out and build it, so I'm leaving him to it.Hi Andy, Ok, but I had already done it, so I thought I may as well post the files. The irregular diamond came out (left to right below) as: V 1 : 8.38 RAM K 1 : 5.75 RAM K 1 : 5.75 RAM V 1 : 4.63 RAM slattocks_junc_mod_c.png I can't upload that as a .box file compatible with your version 091c, so I have exported a DXF file and re-imported it into the background shapes in version 091c, like this: slattocks_junc_mod_d.png The .bgs file is attached below. Do add file... in your background shapes and you should get the result as above. Then when printed, it should look like this (assuming you have background shapes switched on for printing). It is very evident that the one half-diamond is much longer than the other: slattocks_irreg_print.png regards, Martin. |
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Attachment: attach_580_877_slattocks_junction_irreg.bgs 359 | |||
posted: 25 Jun 2009 15:16 from: Andy G click the date to link to this post click member name to view archived images |
Thanks Martin, I'll upload it as we'll then have a complete Templot of the scenic boards rather than having a hole in the middle. I've looked at the slip arrangement you put up and can see that it does fit, I've also sorted out the loop and the other turnouts without having to place the toe of the switch for one into the vee of the other. The only issue I've got with this arrangement is the very short length of plain track between the slip and the toe of the junction. Dick had said that this was avoided if possible. Cheers Andy |
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posted: 25 Jun 2009 15:44 from: Martin Wynne
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Andy G wrote: The only issue I've got with this arrangement is the very short length of plain track between the slip and the toe of the junction. Dick had said that this was avoided if possible.Hi Andy, True, but the way the prototype would avoid that would be to move the slip forward and move the tandem further round the curve. The alternative is to specify over-long switch fronts on the turnout to avoid the short length of plain track. That would be more likely than a complete custom irregular slip design. p.s. By the way, in the double junction the turnouts would ideally be changed to curviform V-crossings, then snake them forward a fraction to align with the diamond. As it stands with contraflexure through the generic crossings, you have a very slight reverse curve in the vee splice rails. regards, Martin. |
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posted: 23 Jul 2009 10:43 from: Andy G click the date to link to this post click member name to view archived images |
Hopefully a final update for a good while, but here is the track plan as it will be implemented. Front side is fixed, we've made the decision that this is what we are building, fiddle yard may be adjusted yet. Regards Andy |
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Attachment: attach_597_877_slattocks_junction_09_07_22_2251_11.box 388 | |||
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