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· In depth idiot
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QUOTE (wolverton bloomer @ 22 Aug 2008, 09:01) <{POST_SNAPBACK}>My minimum radius will be 370mm (= Hornby 1st radius) within the fiddle yards and 505mm (= Hornby 3rd radius) on the mainline.
Hornby state track centres of 67mm but this doesnt look right to my eye.
Steve,

Glad to hear you are at the design stage. First thought for you to consider: the large majority of the better models are now specified for 2nd radius minimum. With a little careful adjustment many can be got to run on 1st radius, but no guarantees.

Set track centres spacing is necessarily much overscale to permit clearance between the longest items of stock on drastically underscale concentric curves. The standard minimum distance between centres in UK double track is 11 feet, scale 44mm. Peco's Streamline points wil give roughly 50mm centres which looks a lot better, and will allow vehicles the length of BR mk1 coaches to just pass on truly concentric curves of 22" and 24" radius. Longer vehicles yet will demand a greater minimum curve radius.

The use of 24" radius points as minimum, and preferably live frog, will not take up much more space than using set track points; but the gain in running reliability is like day from night.

If it is physically possible in the space available to you, ease all curves to greater than set track radii. This and the use of larger radius points than set track may place some limitations on the track formation that can be accomodated when compared to using set track radii. But it is a compromise worth accepting for the gains in both appearance and running reliability.
 

· In depth idiot
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QUOTE (wolverton bloomer @ 22 Aug 2008, 10:47) <{POST_SNAPBACK}>.. which is the best, code 75 or code 100?..
Steve,

Code 75 looks a lot better thanks to the finer rail section, which is a good approximation to scale for 4mm. You will need to use RP25 or equivalent standard wheels - most OO from the last thirty years will run without problems, except Lima which had very deep flanges.

Something further to think about since you have got this far. There is ready to run flexible track from SMP and C&L which is made to represent typical UK sleeper dimensions and spacing; the sleepers are essentially 2.3mm short, the same as the missing 2.3mm in OO track gauge. In comparison to the HO track supplied for OO, to avoid being contentious, let's just say that it is worth seeing in terms of the effect achieved. There are however no matching plastic based RTR points, it's build your own, or buy 'bespoke' from a track maker. Careful use of such plain track with Peco's large radius code 75 points can yield rather good results; Chris Nevard's 'Cement Key' a fairly recently published example.
 

· In depth idiot
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QUOTE (eddscott @ 23 Aug 2008, 19:11) <{POST_SNAPBACK}>Can I just jump in here and ask if other than asthetics, is there any issues with using Peco code 100? ..
From the point of view of its' mechanical and running properties, and also durability, no serious problems. I have points and plain track over 30 years old carefully salvaged from past layouts inside and out, still doing service in concealed sections.
 
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