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A single message from topic:  Creating complex pointwork at Holborn Viaduct   in forum:  Templot talk
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Single message by Geoff Lines       Topic: Creating complex pointwork at Holborn Viaduct
Posted: 27 Mar 2019 13:37
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Geoff Lines
Near St Albans, United Kingdom

 

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Martin Wynne wrote: Hi Geoff,

Many thanks for the file. I can't imagine how long it took to create all that -- I hope you have kept good backups. There is an option to keep them here if you wish, see:

 http://85a.co.uk/forum/view_category.php?id=4

Some parts of it look a bit unlikely to me, for example:



I don't know how you are going to get two V-crossings so close together, and attach a moving switch to them. Do you have a photograph of the prototype? Are you working over a background map? If you say the prototype location we can probably import a map from NLS. I'm guessing the hv in your file name is either High Voltage or Holborn Viaduct? My telepathy machine has had 20 years experience on here.  :)

There are excellent 60"/mile maps from the 1890s available for that location.

How are you planning to build this? Fully chaired or copper-clad?

cheers,

Martin.
Hello Martin -- I've just spent a while crafting an answer to you but I clicked on Preview and lost the lot! In the meantime you've sent me your latest map comparison.
Here goes again. 

Yes, you're right, it's Holborn Viaduct in its original layout and I've spent many hours building up the drawing. I use an external back-up. 

I traced a copy of the original LC&DR plan which I was lucky enough to purchase from BR's Plan Arch back in the 1970s. The OS plan you've compared with shows a removal of two redundant lines but the entrance arrangement just north of Ludgate Hill bridge seems to be awry, and this dissuaded me from using it in the first place. However, I'm beginning to think I should review that decision and contemplate redoing the whole thing basing it on that map.

I do have a photo of this splendid trackwork, but it is from a collection. Can I send a copy to you for your eyes only -- I don't want it to find its way onto the interweb?

The feature you ring in red I've had trouble with. I've been unable to get a divergence to give space enough for full support of the left-hand arm of the V. I've tried putting the peg on the FP and varying the switch type but without success.

I will be fully chaired but I think I shall use the traditional rivet-and-solder technique that Tony W uses so effectively. The downside means many hours applying the cosmetic chairs -- but I've done this before on club layouts.

Regards

Geoff


A single message from topic:  Creating complex pointwork at Holborn Viaduct   in forum:  Templot talk
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