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                                       Longest and shortest
     
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1st message | this message only posted: 31 Dec 2017 22:03
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from:
roythebus
Aldington Frith, Ashford, Kent, United Kingdom

 

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I'm just wondering, what would be the longest workable turnout on 00 and the shortest?  
I've just been playing a bit with Templot and got one with a 1:50 angle, but the warning said the V angle was less than the switch angle. the most that seemed "workable" was 1:45 but I don't think it would be possible for stock to run smoothly over the V. It worked out at nearly 1m long!! The "radius" was about 7m.

As for the shortest workable, I haven't tried that yet.

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2nd message | this message only posted: 1 Jan 2018 00:02
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Hi Roy,

If the V-crossing angle is flatter than the switch heel angle, the result is that the turnout road curves back towards the main road.

That is sometimes done to gain access to industrial premises close to the line, like this:



where a normal turnout would be too sharp.

00 wheels would run fine over a 1:50 V-crossing IF (big if) it is accurately built. And if the wheels are wide enough to match the track standard, as in 4-SF (00-SF). The widest gap in a crossing, across just in front of the nose of the vee, is the same in a 1:50 crossing as in a 1:5 crossing, or any angle.

The longest conventional turnout which can be created using the pre-sets in Templot is 1:80, for which you need the 30ft straight switch. It looks like this, its 1700mm long (5ft-6in):



The 1:80 V-crossing:



For which the vee nose would need to be filed much sharper than most switch blades.

Happy New Year.  :)

Martin.  

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3rd message | this message only posted: 1 Jan 2018 06:55
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from:
roythebus
Aldington Frith, Ashford, Kent, United Kingdom

 

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Thanks for that info Martin. Would such long switches be prototypical should have been the next question! There's some pretty long switches at Ashford on the HS1 line set out for 300km/h running. I was half-tempted to make a 1:50 to see what it would look like. I doubt if it would look right in bullhead rail though. No doubt the prototype would use cast vees.
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4th message | this message only posted: 1 Jan 2018 10:42
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Hi Roy,

The longest crossing normally used in bullhead was 1:20, used in F-20 turnouts.

The SR experimented with a longer G switch in longer turnouts, but the high-speed lines for which they were needed would have been among the first to be converted to flat-bottom. So not much used.

regards,

Martin.

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5th message | this message only posted: 1 Jan 2018 11:05
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from:
roythebus
Aldington Frith, Ashford, Kent, United Kingdom

 

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Thanks, that's worth knowing if ever I get space to build a layout that big!
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from:
Tony W
North Notts., United Kingdom

 

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Hi Roy.
As Martin has already stated, the longest standard Turnout in Bullhead geometry was an F-20.

In Flatbottom track, the 1964 edition of British Railway Track lists G-24 as the longest option with a circular geometry. The lead is 222' 2 3/16".
A G-28 is also listed and illustrated, but this has transitioned geometry and the lead is 227' 4 1/8".
This would have to be created using partial templates.

The shortest standard Bullhead Turnout is an A-4, but these are restricted to sidings and short wheelbase stock only.

Regards
Tony.

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